I need to print a number series like below in javascript
123567101112161718232425
After 3 numbers next will be empty. that will increase as 1 number missed, next 2 number missed like that.
Can anyone help me how to do that..
Something like this might work I believe:
Idea: after every 3 numbers, increase the jump count. Before increasing, just add it to the current Number.
var retStr = '';
var jump = 1;
var currNum = 1;
for(var i=0;i<10;i++){
for(var j=0;j<3;j++){
retStr = retStr + (currNum++);
}
currNum += jump++;
}
console.log(retStr);
Output: "123567101112161718232425313233404142505152616263737475"
var serie = "";
var skip = 0;
for (var i=1; i<100; i++)
{
serie = serie + i + (i+1) + (i+2)
i= i+2
skip = skip +1;
i= i + skip;
}
console.log(serie);
var count = 1 ;
var j=1;
for(var i=0;i<5;i++){
for(j=count; j<(count+3); j++){
document.write(j);
}
count = j+=i+1;
}
function Print(N) {
var arr = [];
var k =0;
var p =0 ;
for (var i = 1; i <= N; i++) {
arr.push(i + k)
if (arr.length % 4 == 0) {
k= k+p ;
p++;
k++;
}
}
return console.log(arr);
}
Print(20)
Related
its me again. This time I tried to make a Selection Sort using JavaScript. Everything went well until my code didn't print the specific output that I want. If you tried to run my code below, the second-last index in the array didn't sort properly. Can anyone give me a brief explanation?
Here's the code by the way,
var num = [30,1,90,3,2,34];
var bilnum = num.length,i,j,min;
var temp = 0;
for(i = 0; i < bilnum - 1; i++){
min = i;
for(j = i + 1; j < bilnum ; j++){
if(num[j] < num[min]){
min = j;
}
if(min != i){
temp = num[i];
num[i] = num[min];
num[min] = temp;
}
}
}
document.write(num)
You need to move the below snippet from the inner loop to the end of the outer loop as you need to swap after finding the min index.
if(min != i){
temp = num[i];
num[i] = num[min];
num[min] = temp;
}
So the code will look something like this
var num = [30,1,90,3,2,34];
var bilnum = num.length,i,j,min;
var temp = 0;
for(i = 0; i < bilnum - 1; i++){
min = i;
for(j = i + 1; j < bilnum ; j++){
if(num[j] < num[min]){
min = j;
}
}
if(min != i){
temp = num[i];
num[i] = num[min];
num[min] = temp;
}
}
console.log(num);
How to rotate a string in javascript and print the rotated versions of string without using any javascript functions, only for loops.
Given a string:
"hell"
Output:
"lhel", "llhe", "ellh", "hell"
I have tried but not succeded
var str1 = "hell";
let i = 0;
let len = str1.length - 1;
let temp;
for (let j = 0; j < len+1; j++) {
temp = str1[len]
while (i < len) {
console.log(str1[i]);
temp += str1[i];
i++;
}
console.log(temp);
//console.log(typeof temp, typeof str1)
str1 = temp;
}
You are almost there ! There is one thing missing, i should be reset at each iteration of the for loop, otherwise, the while (i < len) will be "played" only once :
var str1 = "hell";
let len = str1.length - 1;
let temp;
for (let j = 0; j < len+1; j++) {
let i = 0; // <-------------------- notice this
temp = str1[len]
while (i < len) {
//console.log(str1[i]);
temp += str1[i];
i++;
}
console.log(temp);
//console.log(typeof temp, typeof str1)
str1 = temp;
}
You could take a nested loop and get the characters at the position of i and j and take the reminder operator % for preventing characters outside of the string.
var string = "hell",
i, j,
temp;
for (i = 0; i < string.length; i++) {
temp = '';
for (j = 1; j <= string.length; j++) temp += string[(i + j) % string.length];
console.log(temp);
}
You can try this method. Basically you have two loops the first loop with (i) is for the possibilities the second one is for the shifting
var strValue = "hell";
var temp;
for(var i = 0; i < strValue.length; i++){
temp = "";
for(var j = 1; j < strValue.length; j++){
temp += strValue[j];
}
temp += strValue[0]
strValue = temp;
console.log(strValue)
}
In first loop add all symbols which indexes are greater then amount of shift steps (i in this case).
And add rest symbols after it the second loop.
const str = 'hello';
for (let i = 0; i < str.length; i++) {
let shifted = '';
for (let j = i; j < str.length; j++) {
shifted += str[j];
}
for (let j = 0; j < i; j++) {
shifted += str[j];
}
console.log(shifted);
}
i know this has already been answered so.. this is how i'd do it.
maybe you can learn from it.
const str = "hell";
// this loop will set the offset. so if it's 1, "hell" will become "ellh"
for (let offset = 0; offset < str.length; offset++) {
// this will contain the final string
let output = "";
// here we iterate through all the characters
for (let index = 0; index < str.length; index++) {
// and use modulo to switch 5 to 1 (in case length is 4)
output += str[(index + offset) % str.length];
}
// there we go
console.log(output);
}
let str = 'hell';
for(let i=0;i<str.length;i++){
str = str.substring(1,str.length) + str[0];
console.log(str);
}
My code isn't working . I'm trying to figure out what the bug is . Can someone help ? ! It's a function that is supposed to return an array of the first n triangular numbers.
For example, listTriangularNumbers(5) returns [1,3,6,10,15].
function listTriangularNumbers(n) {
var num;
var array = [];
for (i = 1; i <= n; ++i) {
num = i;
for (j = i; j >= 1; --j) {
num = num + j;
}
array.push(num);
}
return array;
}
Your initial initialization of j is wrong, it's starting at i so it's going too high. Also switched the operators around to make sure the conditions work.
function listTriangularNumbers(n) {
var num;
var array = [];
for (i = 1; i <= n; i++) {
num = i;
for (j = i-1; j >= 1; j--) {
num = num + j;
}
array.push(num);
}
return array;
}
You can try below code to get help:
a = listTriangularNumbers(8);
console.log(a);
function listTriangularNumbers(n) {
var num;
var array = [0];
for (i = 1; i <= n; i++) {
num = 0;
for (j = 1; j <= i; j++) {
num = num + j;
}
array.push(num);
}
return array;
}
You actually don't need 2 for-loops to do this operation. A single for-loop would suffice.
function listTriangularNumbers(n) {
// Initialize result array with first element already inserted
var result = [1];
// Starting the loop from i=2, we sum the value of i
// with the last inserted element in the array.
// Then we push the result in the array
for (i = 2; i <= n; i++) {
result.push(result[result.length - 1] + i);
}
// Return the result
return result;
}
console.log(listTriangularNumbers(5));
function listTriangularNumbers(n) {
var num;
var array = [];
for (i = 1; i <= n; ++i) {
num = i;
for (j = i-1; j >= 1; --j) {
num = num + j;
}
array.push(num);
}
return array;
}
var print=listTriangularNumbers(5);
console.log(print);
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);
});
$rowCount = 40 ;
for (var $j = 0; $j < $rowCount -1; $j++) {
var currentNum = #something
}
I need to have a mechanism, where I can loop in a way that I will be applying the values to the currentNum in a random way.
Eg: At the end of the loop, the currentNum should have the value (0....39). But it shouldn't be applied starting from 0,1,2,3,4,5,6,7,8,.....39.
It should be applied in a random way like 39, 4, 5,17, 28 , 16 .... and it should cover all the numbers from 0-40. I figured this can be achieved using a HashMap in java, but how to implement in javascript?
var numbers = Array(rowCount);
for(var i = 0; i < rowCount; i++) numbers[i] = i;
shuffle(numbers); // randomly shuffle array elements
for (var $j = 0; $j < $rowCount -1; $j++) {
var currentNum = numbers[i];
}
You can try something like this:
var _data = [];
for (var i = 0; i < 40; i++) {
_data.push(i);
}
var result = [];
_data.slice().forEach(function(){
result.push(getRandomValue(_data))
});
function getRandomValue(arr,i) {
var r = Math.floor(Math.random() * arr.length);
var result = arr[r];
arr.splice(r, 1);
return result;
}
document.write("<pre>" + JSON.stringify(result,0,4) + "</pre>");