Array loop in javascript - javascript

I try to develop a simple program that prints all numbers in between 1 and 100 that divide by 3 without any residual and calculate the total sum
I did it with for loop:
var sum = 0;
for (var i = 3; i <= 100; i = i + 3) {
document.write("<br/>" + i);
sum = sum + i;
}
document.write("<br/>sum = " + sum); //1683
But I failed when I wanted to do it with array:
var numbers = [];
var sum = 0;
for (var i = 0; i <= 100; i = i + 3) {
numbers[i - 1] = i;
}
for (var index = 0; index < 100; index++) {
document.write("<br/>" + numbers[index]);
sum = sum + i;
}
document.write("<br/>sum = " + sum);


Use it like this,
Array indexes should start from 0, that is why I have introduced another variable j=0
var numbers = [];
var sum = 0;
for (var i = 0, j = 0; i <= 100; i = i + 3, ++j) {
numbers[j] = i;
}
Update
First Issue:
In your code, ie. below code of yours,
for (var i = 0; i <= 100; i = i + 3) {
numbers[i - 1] = i;
}
In the first iteration,
i = 0;
numbers[0-1] = i // i.e numbers[-1] = 0;
and in your second loop, you are starting the index from 0
for (var index = 0; index < 100; index++) {
Second issue:
Also, if you don't use a sequential counter to fill the Array, you will end with undefined values for the ones you did not fill.
If you notice, the output after the loop, it says numbers.length = 99 which is wrong it will not have that many items in it.
Third Issue:
In below code, even if you introduce a sequential counter, this is still wrong
for (var i = 0; i <= 100; i = i + 3) {
numbers[i - 1] = i;
}
because i should start with 3 instead of 0, otherwise you will end up with 34 elements in the array because numbers[0] will be 0;
Fourth Issue:
In this code,
for (var index = 0; index < 100; index++) {
document.write("<br/>" + numbers[index]);
sum = sum + i;
}
You don't actually have to loop it till 100, you already have the numbers array filled, so you just need to use numbers.length, like this
var len = numbers.length;
for (var index = 0; index < len; index++) {
document.write("<br/>" + numbers[index]);
sum = sum + i;
}
A better way to write this
var numbers = [];
for (var i = 3, j=0; i <= 100; i = i + 3, j++) {
numbers[j] = i;
}
var sum = numbers.reduce((a, b) => a+b);
console.log(sum);
The line var sum = numbers.reduce((a, b) => a+b); uses Array.reduce() method.


adding number to array
var numbers = [];
for(var i = 3; i <= 100; i = i +3){
numbers.push(i);
}
summation and printing values
var sum = 0;
for (var i = 0; i < numbers.length; i++) {
document.write("<br/>" + numbers[i]);
sum = sum + numbers[i];
}
document.write("<br/>sum = " + sum); //1683


There are few issues in your code.
for (var i = 0; i <= 100; i = i + 3) {
numbers[i - 1] = i;
}
1: array is 0 based. so first insertion into the array goes for a toss.
2: the number array created will have skipping index like 3, 6 ,9
for (var index = 0; index < 100; index++) {
document.write("<br/>" + numbers[index]);
sum = sum + i;
}
3: Here you are iterating index till 100 , you should iterate it till the length of the numbers array only.
when index is 1,2
number[index] will become undefined.
4: sum = sum + i (i ??????)
You should try like this or you can also use push()
var numbers = [];
var sum = 0;
for (var i = 0,j=0; i <= 100; i = i + 3, j= j+1) {
numbers[j] = i; // array is 0 based.
}
for (var index = 0; index < numbers.length; index++) {
document.write("<br/>" + numbers[index]);
sum = sum + numbers[index];
}
document.write("<br/>sum = " + sum);


Indexes in an array begin with zero.
for (var i = 0; i <= 100; i = i + 3) {
numbers[i - 1] = i; // In the first iteration, there will be numbers[-1] = i;
}


You have several issues i suppose.
var numbers = [];
var sum = 0;
for (var i = 0; i <= 100; i = i + 3) {
numbers.push(i);
}
for (var index = 0; index < numbers.length; index++) {
document.write("<br/>" + numbers[index]);
sum = sum + i;
}
document.write("<br/>sum = " + sum);
Also for array you can use:
for (var i in array) {
console.log(array[i]);
}
And I'm pretty sure, that array of number sequence is absolutely useless, if there is no other information in it.


Try this
var numbers = [];
var sum = 0;
for (var i = 0; i <= 100; i = i + 3) {
numbers[(i-3)/3] = i;
}
for (var index = 0; index < numbers.length; index++) {
document.write("<br/>" + numbers[index]);
sum = sum + numbers[index];
}
document.write("<br/>sum = " + sum);
Here is the fiddle i tried
https://jsfiddle.net/4ncgnd7c/


This should work using a single loop
var numbers = [];
var sum = 0;
for (var i = 3; i <= 100; i = i + 3) {
numbers[i] = i;
document.write("<br/>" + i);
sum = sum + i;
}
document.write("<br/>sum = " + sum);

Related

I'm having trouble adding these elements of my array together. the dash seems to inhibit the addition of each variable

I'm trying to get the following code to add each number in the element separately and not the whole array together but the dash seems to stop the loop from calculating the total sum of each element. I can't seem to make it so it'll except any length of number for the variable. Any help is greatly appreciated!
var creditNum = [];
creditNum[0] = ('4916-2600-1804-0530');
creditNum[1] = ('4779-252888-3972');
creditNum[2] = ('4252-278893-7978');
creditNum[3] = ('4556-4242-9283-2260');
var allNum = [];
var total = 0;
var num = 0;
var cnt = 0;
for (var i = 0; i < creditNum.length; i++) {
num = creditNum[i];
for (var j = 1; j <= num.length; j++) {
var num = creditNum[i].substring(cnt, j);
console.log(creditNum[i].charAt(cnt));
console.log(cnt, j);
cnt = cnt + 1;
}
if (num != "-") j = j++;
console.log(parseInt(num));
}
console.log(total);

Assuming the intent is to add '4916-2600-1804-0530' and output the value as 49, then the following modification will achieve that.
var creditNum = ['4916-2600-1804-0530', '4779-252888-3972', '4252-278893-7978','4556-4242-9283-2260'];
for (var i = 0; i < creditNum.length; i++) {
var num = creditNum[i].replace(/\-/g, '');
var total = 0;
for (var j = 0; j < num.length; j++) {
total += Number(num[j]);
}
console.log(creditNum[i], total);
}
Using native array methods, the code can be refactored as the following.
var creditNumbers = ['4916-2600-1804-0530', '4779-252888-3972', '4252-278893-7978','4556-4242-9283-2260'];
creditNumbers.forEach(function(creditNumber) {
var num = creditNumber.replace(/\-/g, '').split('');
var total = num.reduce(function(tally, val) {
return tally += Number(val);
}, 0);
console.log(creditNumber, total);
});

Binary to Decimal Javascript

This code is supposed to take in a string ("100101") and output the result in decimal.I'm not quite sure why it's not working.Any help would be appreciated.
function BinaryConverter(str) {
var num=str.split("");
var powers=[];
var sum=0;
for(var i=0;i<num.length;i++){
powers.push(i);
}
for(var i=powers.length-1;i>=0;i--){
for(var j=0;j<num.length;i++){
sum+=Math.pow(2,i)*num[j];
}
}
return sum;
};
Here's my updated code below .For an input "011" it should do( 2^2*0 +2^1*1 +2^0*1)to =3 but it returns 14.Anybody know where I'm going wrong?
function BinaryConverter(str) {
var num=str.split("");
var powers=[];
var sum=0;
for(var i=0;i<num.length;i++){
powers.push(i);
}
for(var i=powers.length-1;i>=0;i--){
for(var j=0;j<num.length;j++){
sum+=Math.pow(2,i)*num[j];
}
}
return sum;
};

The two nested for loops have a problem. The first one subtracts an i, while the second adds an i forever creating a never ending loop.
ALSO your code should be this:
function BinaryConverter(str) {
var num=str.split("");
var powers=[];
var sum=0;
var numlength=num.length;
for(var i=0;i<num.length;i++){
powers.push(i);
}
for(var i=powers.length-1;i>=0;i--){
sum+=Math.pow(2,i)*num[numlength-i-1];
}
return sum;
};
I don't think you need the nested for loop

If you don't want to do that with parseInt() for some reason (like, because the homework problem says you can't), you can do this without the complexity and expense of calling Math.pow() for each digit:
function parseBinary(str) {
var i, value = 0;
for (i = 0; i < str.length; ++i)
value = value * 2 + +str[i];
return value;
}
That doesn't check for invalid input strings.

ace040686 only inverted the pow(2,i) and num[len-1-i] in his answer, otherwise it would be correct. Also you're pushing 0..str.length-1 unnecessarily to powers, those are implicit indices.
function convertNaive(str) {
var num = str.split("");
var len = num.length;
var sum = 0;
for(var i = len - 1; i >= 0; --i)
sum += Math.pow(2, len - 1 - i) * num[i];
return sum;
}
You can improve this a bit to avoid the unnecessary array and especially Math.pow:
function convertImproved(str) {
var len = str.length;
var sum = 0;
for(var i = 0, fac = 1; i < len; ++i, fac *= 2)
sum += fac * str[len - 1 - i];
return sum;
}
Try it yourself:
var input = "100101";
var logNode = document.getElementById("log");
function log(line) {
var text = document.createTextNode(line);
var node = document.createElement("p");
node.appendChild(text);
logNode.appendChild(node);
}
function convertNaive(str) {
var num = str.split("");
var len = num.length;
var sum = 0;
for(var i = len - 1; i >= 0; --i)
sum += Math.pow(2, len - 1 - i) * num[i];
return sum;
}
function convertImproved(str) {
var len = str.length;
var sum = 0;
for(var i = 0, fac = 1; i < len; ++i, fac *= 2)
sum += fac * str[len - 1 - i];
return sum;
}
log("input: " + input);
log("parseInt(input, 2): " + parseInt(input, 2));
log("convertNaive(input): " + convertNaive(input));
log("convertImproved(input): " + convertImproved(input));
<div id="log" />

Here is the simple implementation of binary to decimal in javascript.
main();
function main() {
let binaryInput = 10000100111;
let decimalOutput = binaryTodecimal(binaryInput);
console.log(decimalOutput);
}
function binaryTodecimal(input) {
let inputString = input.toString();
let result = 0;
let exponent = 1;
let currentBit = 0;
for (let i = inputString.length - 1; i >= 0; i--) {
currentBit = parseInt(inputString[i]);
currentBit *= exponent;
result += currentBit;
exponent *= 2;
}
return result;
}

Project Euler - 67

I was working through problem 67 on Project Euler, and this is the following code I used: (sorry if kind of messy
var everything = [59,73,41,52,40,09,26,53,06,34,10,51,87,86,81,61,95,66,57,25,68,90,81,80,38,92,67,73,30,28,51,76,81,18,75,44,84,14,95,87,62,81,17,78,58,21,46,71,58,02,79,62,39,31,09,56,34,35,53,78,31,81,18,90,93,15,78,53,04,21,84,93,32,13,97,11,37,51,45,03,81,79,05,18,78,86,13,30,63,99,95,39,87,96,28,03,38,42,17,82,87,58,07,22,57,06,17,51,17,07,93,09,07,75,97,95,78,87,08,53,67,66,59,60,88,99,94,65,55,77,55,34,27,53,78,28,76,40,41,04,87,16,09,42,75,69,23,97,30,60,10,79,87,12,10,44,26,21,36,32,84,98,60,13,12,36,16,63,31,91,35,70,39,06,05,55,27,38,48,28,22,34,35,62,62,15,14,94,89,86,66,56,68,84,96,21,34,34,34,81,62,40,65,54,62,05,98,03,02,60,38,89,46,37,99,54,34,53,36,14,70,26,02,90,45,13,31,61,83,73,47,36,10,63,96,60,49,41,05,37,42,14,58,84,93,96,17,09,43,05,43,06,59,66,57,87,57,61,28,37,51,84,73,79,15,39,95,88,87,43,39,11,86,77,74,18,54,42,05,79,30,49,99,73,46,37,50,02,45,09,54,52,27,95,27,65,19,45,26,45,71,39,17,78,76,29,52,90,18,99,78,19,35,62,71,19,23,65,93,85,49,33,75,09,02,33,24,47,61,60,55,32,88,57,55,91,54,46,57,07,77,98,52,80,99,24,25,46,78,79,05,92,09,13,55,10,67,26,78,76,82,63,49,51,31,24,68,05,57,07,54,69,21,67,43,17,63,12,24,59,06,08,98,74,66,26,61,60,13,03,09,09,24,30,71,08,88,70,72,70,29,90,11,82,41,34,66,82,67,04,36,60,92,77,91,85,62,49,59,61,30,90,29,94,26,41,89,04,53,22,83,41,09,74,90,48,28,26,37,28,52,77,26,51,32,18,98,79,36,62,13,17,08,19,54,89,29,73,68,42,14,08,16,70,37,37,60,69,70,72,71,09,59,13,60,38,13,57,36,09,30,43,89,30,39,15,02,44,73,05,73,26,63,56,86,12,55,55,85,50,62,99,84,77,28,85,03,21,27,22,19,26,82,69,54,04,13,07,85,14,01,15,70,59,89,95,10,19,04,09,31,92,91,38,92,86,98,75,21,05,64,42,62,84,36,20,73,42,21,23,22,51,51,79,25,45,85,53,03,43,22,75,63,02,49,14,12,89,14,60,78,92,16,44,82,38,30,72,11,46,52,90,27,08,65,78,03,85,41,57,79,39,52,33,48,78,27,56,56,39,13,19,43,86,72,58,95,39,07,04,34,21,98,39,15,39,84,89,69,84,46,37,57,59,35,59,50,26,15,93,42,89,36,27,78,91,24,11,17,41,05,94,07,69,51,96,03,96,47,90,90,45,91,20,50,56,10,32,36,49,04,53,85,92,25,65,52,09,61,30,61,97,66,21,96,92,98,90,06,34,96,60,32,69,68,33,75,84,18,31,71,50,84,63,03,03,19,11,28,42,75,45,45,61,31,61,68,96,34,49,39,05,71,76,59,62,67,06,47,96,99,34,21,32,47,52,07,71,60,42,72,94,56,82,83,84,40,94,87,82,46,01,20,60,14,17,38,26,78,66,81,45,95,18,51,98,81,48,16,53,88,37,52,69,95,72,93,22,34,98,20,54,27,73,61,56,63,60,34,63,93,42,94,83,47,61,27,51,79,79,45,01,44,73,31,70,83,42,88,25,53,51,30,15,65,94,80,44,61,84,12,77,02,62,02,65,94,42,14,94,32,73,09,67,68,29,74,98,10,19,85,48,38,31,85,67,53,93,93,77,47,67,39,72,94,53,18,43,77,40,78,32,29,59,24,06,02,83,50,60,66,32,01,44,30,16,51,15,81,98,15,10,62,86,79,50,62,45,60,70,38,31,85,65,61,64,06,69,84,14,22,56,43,09,48,66,69,83,91,60,40,36,61,92,48,22,99,15,95,64,43,01,16,94,02,99,19,17,69,11,58,97,56,89,31,77,45,67,96,12,73,08,20,36,47,81,44,50,64,68,85,40,81,85,52,09,91,35,92,45,32,84,62,15,19,64,21,66,06,01,52,80,62,59,12,25,88,28,91,50,40,16,22,99,92,79,87,51,21,77,74,77,07,42,38,42,74,83,02,05,46,19,77,66,24,18,05,32,02,84,31,99,92,58,96,72,91,36,62,99,55,29,53,42,12,37,26,58,89,50,66,19,82,75,12,48,24,87,91,85,02,07,03,76,86,99,98,84,93,07,17,33,61,92,20,66,60,24,66,40,30,67,05,37,29,24,96,03,27,70,62,13,04,45,47,59,88,43,20,66,15,46,92,30,04,71,66,78,70,53,99,67,60,38,06,88,04,17,72,10,99,71,07,42,25,54,05,26,64,91,50,45,71,06,30,67,48,69,82,08,56,80,67,18,46,66,63,01,20,08,80,47,07,91,16,03,79,87,18,54,78,49,80,48,77,40,68,23,60,88,58,80,33,57,11,69,55,53,64,02,94,49,60,92,16,35,81,21,82,96,25,24,96,18,02,05,49,03,50,77,06,32,84,27,18,38,68,01,50,04,03,21,42,94,53,24,89,05,92,26,52,36,68,11,85,01,04,42,02,45,15,06,50,04,53,73,25,74,81,88,98,21,67,84,79,97,99,20,95,04,40,46,02,58,87,94,10,02,78,88,52,21,03,88,60,06,53,49,71,20,91,12,65,07,49,21,22,11,41,58,99,36,16,09,48,17,24,52,36,23,15,72,16,84,56,02,99,43,76,81,71,29,39,49,17,64,39,59,84,86,16,17,66,03,09,43,06,64,18,63,29,68,06,23,07,87,14,26,35,17,12,98,41,53,64,78,18,98,27,28,84,80,67,75,62,10,11,76,90,54,10,05,54,41,39,66,43,83,18,37,32,31,52,29,95,47,08,76,35,11,04,53,35,43,34,10,52,57,12,36,20,39,40,55,78,44,07,31,38,26,08,15,56,88,86,01,52,62,10,24,32,05,60,65,53,28,57,99,03,50,03,52,07,73,49,92,66,80,01,46,08,67,25,36,73,93,07,42,25,53,13,96,76,83,87,90,54,89,78,22,78,91,73,51,69,09,79,94,83,53,09,40,69,62,10,79,49,47,03,81,30,71,54,73,33,51,76,59,54,79,37,56,45,84,17,62,21,98,69,41,95,65,24,39,37,62,03,24,48,54,64,46,82,71,78,33,67,09,16,96,68,52,74,79,68,32,21,13,78,96,60,09,69,20,36,73,26,21,44,46,38,17,83,65,98,07,23,52,46,61,97,33,13,60,31,70,15,36,77,31,58,56,93,75,68,21,36,69,53,90,75,25,82,39,50,65,94,29,30,11,33,11,13,96,02,56,47,07,49,02,76,46,73,30,10,20,60,70,14,56,34,26,37,39,48,24,55,76,84,91,39,86,95,61,50,14,53,93,64,67,37,31,10,84,42,70,48,20,10,72,60,61,84,79,69,65,99,73,89,25,85,48,92,56,97,16,03,14,80,27,22,30,44,27,67,75,79,32,51,54,81,29,65,14,19,04,13,82,04,91,43,40,12,52,29,99,07,76,60,25,01,07,61,71,37,92,40,47,99,66,57,01,43,44,22,40,53,53,09,69,26,81,07,49,80,56,90,93,87,47,13,75,28,87,23,72,7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34,45,09,97,86,71,03,15,56,19,15,44,97,31,90,04,87,87,76,08,12,30,24,62,84,28,12,85,82,53,99,52,13,94,06,65,97,86,09,50,94,68,69,74,30,67,87,94,63,07,78,27,80,36,69,41,06,92,32,78,37,82,30,05,18,87,99,72,19,99,44,20,55,77,69,91,27,31,28,81,80,27,02,07,97,23,95,98,12,25,75,29,47,71,07,47,78,39,41,59,27,76,13,15,66,61,68,35,69,86,16,53,67,63,99,85,41,56,08,28,33,40,94,76,90,85,31,70,24,65,84,65,99,82,19,25,54,37,21,46,33,02,52,99,51,33,26,04,87,02,08,18,96,54,42,61,45,91,06,64,79,80,82,32,16,83,63,42,49,19,78,65,97,40,42,14,61,49,34,04,18,25,98,59,30,82,72,26,88,54,36,21,75,03,88,99,53,46,51,55,78,22,94,34,40,68,87,84,25,30,76,25,08,92,84,42,61,40,38,09,99,40,23,29,39,46,55,10,90,35,84,56,70,63,23,91,39,52,92,03,71,89,07,09,37,68,66,58,20,44,92,51,56,13,71,79,99,26,37,02,06,16,67,36,52,58,16,79,73,56,60,59,27,44,77,94,82,20,50,98,33,09,87,94,37,40,83,64,83,58,85,17,76,53,02,83,52,22,27,39,20,48,92,45,21,09,42,24,23,12,37,52,28,50,78,79,20,86,62,73,20,59,54,96,80,15,91,90,99,70,10,09,58,90,93,50,81,99,54,38,36,10,30,11,35,84,16,45,82,18,11,97,36,43,96,79,97,65,40,48,23,19,17,31,64,52,65,65,37,32,65,76,99,79,34,65,79,27,55,33,03,01,33,27,61,28,66,08,04,70,49,46,48,83,01,45,19,96,13,81,14,21,31,79,93,85,50,05,92,92,48,84,59,98,31,53,23,27,15,22,79,95,24,76,05,79,16,93,97,89,38,89,42,83,02,88,94,95,82,21,01,97,48,39,31,78,09,65,50,56,97,61,01,07,65,27,21,23,14,15,80,97,44,78,49,35,33,45,81,74,34,05,31,57,09,38,94,07,69,54,69,32,65,68,46,68,78,90,24,28,49,51,45,86,35,41,63,89,76,87,31,86,09,46,14,87,82,22,29,47,16,13,10,70,72,82,95,48,64,58,43,13,75,42,69,21,12,67,13,64,85,58,23,98,09,37,76,05,22,31,12,66,50,29,99,86,72,45,25,10,28,19,06,90,43,29,31,67,79,46,25,74,14,97,35,76,37,65,46,23,82,06,22,30,76,93,66,94,17,96,13,20,72,63,40,78,08,52,09,90,41,70,28,36,14,46,44,85,96,24,52,58,15,87,37,05,98,99,39,13,61,76,38,44,99,83,74,90,22,53,80,56,98,30,51,63,39,44,30,91,91,04,22,27,73,17,35,53,18,35,45,54,56,27,78,48,13,69,36,44,38,71,25,30,56,15,22,73,43,32,69,59,25,93,83,45,11,34,94,44,39,92,12,36,56,88,13,96,16,12,55,54,11,47,19,78,17,17,68,81,77,51,42,55,99,85,66,27,81,79,93,42,65,61,69,74,14,01,18,56,12,01,58,37,91,22,42,66,83,25,19,04,96,41,25,45,18,69,96,88,36,93,10,12,98,32,44,83,83,04,72,91,04,27,73,07,34,37,71,60,59,31,01,54,54,44,96,93,83,36,04,45,30,18,22,20,42,96,65,79,17,41,55,69,94,81,29,80,91,31,85,25,47,26,43,49,02,99,34,67,99,76,16,14,15,93,08,32,99,44,61,77,67,50,43,55,87,55,53,72,17,46,62,25,50,99,73,05,93,48,17,31,70,80,59,09,44,59,45,13,74,66,58,94,87,73,16,14,85,38,74,99,64,23,79,28,71,42,20,37,82,31,23,51,96,39,65,46,71,56,13,29,68,53,86,45,33,51,49,12,91,21,21,76,85,02,17,98,15,46,12,60,21,88,30,92,83,44,59,42,50,27,88,46,86,94,73,45,54,23,24,14,10,94,21,20,34,23,51,04,83,99,75,90,63,60,16,22,33,83,70,11,32,10,50,29,30,83,46,11,05,31,17,86,42,49,01,44,63,28,60,07,78,95,40,44,61,89,59,04,49,51,27,69,71,46,76,44,04,09,34,56,39,15,06,94,91,75,90,65,27,56,23,74,06,23,33,36,69,14,39,05,34,35,57,33,22,76,46,56,10,61,65,98,09,16,69,04,62,65,18,99,76,49,18,72,66,73,83,82,40,76,31,89,91,27,88,17,35,41,35,32,51,32,67,52,68,74,85,80,57,07,11,62,66,47,22,67,65,37,19,97,26,17,16,24,24,17,50,37,64,82,24,36,32,11,68,34,69,31,32,89,79,93,96,68,49,90,14,23,04,04,67,99,81,74,70,74,36,96,68,09,64,39,88,35,54,89,96,58,66,27,88,97,32,14,06,35,78,20,71,06,85,66,57,02,58,91,72,05,29,56,73,48,86,52,09,93,22,57,79,42,12,01,31,68,17,59,63,76,07,77,73,81,14,13,17,20,11,09,01,83,08,85,91,70,84,63,62,77,37,07,47,01,59,95,39,69,39,21,99,09,87,02,97,16,92,36,74,71,90,66,33,73,73,75,52,91,11,12,26,53,05,26,26,48,61,50,90,65,01,87,42,47,74,35,22,73,24,26,56,70,52,05,48,41,31,18,83,27,21,39,80,85,26,08,44,02,71,07,63,22,05,52,19,08,20,17,25,21,11,72,93,33,49,64,23,53,82,03,13,91,65,85,02,40,05,42,31,77,42,05,36,06,54,04,58,07,76,87,83,25,57,66,12,74,33,85,37,74,32,20,69,03,97,91,68,82,44,19,14,89,28,85,85,80,53,34,87,58,98,88,78,48,65,98,40,11,57,10,67,70,81,60,79,74,72,97,59,79,47,30,20,54,80,89,91,14,05,33,36,79,39,60,85,59,39,60,07,57,76,77,92,06,35,15,72,23,41,45,52,95,18,64,79,86,53,56,31,69,11,91,31,84,50,44,82,22,81,41,40,30,42,30,91,48,94,74,76,64,58,74,25,96,57,14,19,03,99,28,83,15,75,99,01,89,85,79,50,03,95,32,67,44,08,07,41,62,64,29,20,14,76,26,55,48,71,69,66,19,72,44,25,14,01,48,74,12,98,07,64,66,84,24,18,16,27,48,20,14,47,69,30,86,48,40,23,16,61,21,51,50,26,47,35,33,91,28,78,64,43,68,04,79,51,08,19,60,52,95,06,68,46,86,35,97,27,58,04,65,30,58,99,12,12,75,91,39,50,31,42,64,70,04,46,07,98,73,98,93,37,89,77,91,64,71,64,65,66,21,78,62,81,74,42,20,83,70,73,95,78,45,92,27,34,53,71,15,30,11,85,31,34,71,13,48,05,14,44,03,19,67,23,73,19,57,06,90,94,72,57,69,81,62,59,68,88,57,55,69,49,13,07,87,97,80,89,05,71,05,05,26,38,40,16,62,45,99,18,38,98,24,21,26,62,74,69,04,85,57,77,35,58,67,91,79,79,57,86,28,66,34,72,51,76,78,36,95,63,90,08,78,47,63,45,31,22,70,52,48,79,94,15,77,61,67,68,23,33,44,81,80,92,93,75,94,88,23,61,39,76,22,03,28,94,32,06,49,65,41,34,18,23,08,47,62,60,03,63,33,13,80,52,31,54,73,43,70,26,16,69,57,87,83,31,03,93,70,81,47,95,77,44,29,68,39,51,56,59,63,07,25,70,07,77,43,53,64,03,94,42,95,39,18,01,66,21,16,97,20,50,90,16,70,10,95,69,29,06,25,61,41,26,15,59,63,35];
function getRow(row) {
if(row == 1) return 59;
else {
var num = 0;
var array = [];
for(var i = 1;i < row;i ++) {
num += i;
}
for(var i = 0;i < row;i ++) {
array = array.concat(everything[i + num])
}
return array;
}
}
function pickHighest(lastnumplace, lastrow) {
var highest = [];
var row = getRow(lastrow + 1);
highest = highest.concat(Math.max(row[lastnumplace - 1], row[lastnumplace]));
highest = highest.concat(lastrow + 1);
if(Math.max(row[lastnumplace - 1], row[lastnumplace]) == row[lastnumplace - 1]) highest = highest.concat(lastnumplace);
else highest = highest.concat(lastnumplace + 1);
return highest;
}
var sum = 0;
var highest;
for(var i = 1;i <= 100;i ++) {
if(i == 1) {
highest = [59, 1, 1];
sum += 59;
}
else {
highest = pickHighest(highest[2], i - 1);
sum += highest[0];
}
document.write(sum + " " + highest + "<br>");
}
alert(sum);
alert(i);
For some strange reason, I always get 6580.
https://projecteuler.net/problem=67
Help?

In 'getRow' function you are adding all row elements in the loop, but it is not increasing by the number of elements as you wrote but '2^row number' - you just summed the elements from the previous row.
From row 3 it will not work.

how to multiply and adding two dimensional arrays

I have variable with string values in two dimensional array format.
var arrayList=[["1","2"],["6","3600","11","60"],["1","2","3","4","5","6"]];
What I want,each odd position value multiply with next even position and finally adding that values
like.
["1","2"]=(1*2);
["6","3600","11","60"]=((6*3600)+(11*60));
["1","2","3","4","5","6"]=((1*2)+(3*4)+(5*6))
for this I written the following code,second and third cases are not working.
really sorry might be it's very basic question but I tested each and every line it's seems code is correct but in second and third cases getting Nan.
var result=[];
for (var index = 0; index < arrayList.length; index++) {
var innerResult=0;
for (var jndex = 0; jndex < arrayList[index].length; jndex++) {
var cali=parseInt(arrayList[index][jndex])*parseInt(arrayList[index][jndex+1]);
innerResult=innerResult+cali;
jndex=jndex+2;
};
result.push(innerResult);
};
result
I am getting like this [3,Nan,Nan].
please can anyone help me.
Thanks

You're incrementing jndex on each loop and then you are adding 2 more at the end of that loop. You have two options, changing this:
for (var jndex = 0; jndex < arrayList[index].length; jndex++) {
to:
for (var jndex = 0; jndex < arrayList[index].length; jndex+=2 ) {
or this:
jndex=jndex+2;
to:
jndex=jndex+1;
If you do the first one, you no longer need the increment within the loop.

I have written this algorithm that I believe might help you.
var array = [["1","2"],["6","3600","11","60"],["1","2","3","4","5","6"]];
array.map(function(subArray){
var total = 0;
for(var i = 1; i < subArray.length; i += 2)
total += parseInt(subArray[i], 10) * parseInt(subArray[i - 1], 10);
return total;
});

The jindex will be incremented by the loop as well. This will mean the jindex is incremented by 3 each loop.
Consider the case where jindex is arrayList[index].length - 1; when you parseInt(arrayList[index][jndex+1]) you will reach outside the bounds of the array, and get undefined (and parseInt(undefined) is NaN again).
If you fix those, you should find your code works;
var result = [];
for (var index = 0; index < arrayList.length; index++) {
var innerResult = 0;
for (var jndex = 0; jndex < arrayList[index].length - 1; jndex++) {
var cali = parseInt(arrayList[index][jndex]) * parseInt(arrayList[index][jndex + 1]);
innerResult = innerResult + cali;
jndex = jndex + 1;
};
}
http://jsfiddle.net/Bwx2g/

Try this:
var result = [];
for (var index = 0; index < arrayList.length; index++) {
var innerResult = 0;
for (var jndex = 0; jndex < arrayList[index].length;) {
var cali = (parseInt(arrayList[index][jndex]) * parseInt(arrayList[index][jndex + 1]));
innerResult = innerResult + cali;
jndex = jndex + 2;
}
result.push(innerResult);
}

Inner for loop changed to while loop (you have double increment in for loop):
var result = [];
for (var index = 0; index < arrayList.length; index++) {
var innerResult = 0;
var j = 0;
while (j < arrayList[index].length) {
var cali = parseInt(arrayList[index][j]) * parseInt(arrayList[index][j + 1]);
innerResult = innerResult + cali;
j += 2;
}
result.push(innerResult);
};

How to count a javascript array and get output like this?

i have a array like this
["5763.34", "5500.00", "5541.67", "5541.67"]
i want to count similar values and get a out put like
(1 * 5763.34) + (1 * 5500.00) + (2 * 5541.67)
any idea how to do this?

Count values:
var array = ["5763.34", "5500.00", "5541.67", "5541.67"]
var counts = {};
for (var i = 0; i < array.length; ++i) {
var val = array[i];
if (val in counts) {
counts[val]++;
} else {
counts[val] = 1;
}
}
Print them:
var strings = [];
for (var k in counts) {
strings.push('(' + counts[k] + ' * ' + k + ')');
}
alert(strings.join(' + '));
Try it here: http://jsfiddle.net/k46kL/1

do it like this
sum = 0
for(i=0; i< array.length; i++){
sum += array[i] * (i+1)
}

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