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How do I write a function to multiple numbers from 1-10? [closed]

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var a = 7;
var b;
for (var i = 1; i <= 10 ; i++) {
b = a * i;
document.write(" " +a+ "*", + b + "<br>");
}
This works however it has to be a loop, not code for one specific number so I need to write it so it goes for all numbers 1 through 10.
I'm using http://js.do which we have to use.

You need to have two loops - one nested inside the other - both going from 1 to 10.
Something like:
for (let i = 1; i <= 10; i++) {
for (let j = 1; j <= 10; j++) {
let s = i * j;
document.write(i + "*" + j + "=" + s + "<br>");
}
}
Or, to allow the user to enter a number of their choice:
let a = prompt("Enter a number: ");
if (a) {
for (let i = 1; i <= 10; i++) {
let b = i * a;
document.write(a + "*" + i + "=" + b + "<br>");
}
}

var a;
var b;
for (var a = 1; a <= 10 ; a++) { // loop the a number 1 to 10
for (var i = 1; i <= 10 ; i++) {
b = a * i;
document.write(" " +a+ "*", + b + "<br>");
}
}

Javascript row number using for loop? [closed]

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Can anyone help me with this Javascript problem? The code I've write is not quite right.
function tes() {
var c = document.getElementById('Text');
var a = document.getElementById('a').value;
var txt = '';
for (i = 1; i <= a; i++) {
for (j = 1; j <= a; j++) {
if (j == i) {
txt += i.toString();
} else {
txt += i.toString();
}
}
txt += '<br/>';
}
c.innerHTML = txt;
}
<input id="a">
<button onclick="tes()">Input</button>
<div id="Text"></div>
Javasript Problem
Expected output:
1 1 1 1 1
1 1 1 2 2
1 1 3 3 3
1 4 4 4 4
5 5 5 5 5

Since your problem required an input, you would be running the code when input is received. The only thing you got incorrect was really the if statement logic. rowAmm is a variable holding for the amount of 1s in a row, if j was less than that, add another 1, otherwise add i which was the row number.
You won't have to do a .toString() function either if you're adding it to a variable which is already declared a string var txt = ''. Just like 5 + "5" will become 55 while 5 + 5 will be 10
var a = document.getElementById("a");
var textBox = document.getElementById("Text");
function makeSquare() {
var b = a.value;
var txt = '';
for (i = 1; i <= b; i++) {
var rowAmm = b - i;
for (j = 1; j <= b; j++) {
if (j <= rowAmm) {
txt += "1";
} else {
txt += i;
}
}
txt += '<br/>';
}
textBox.innerHTML = txt;
}
<input id="a">
<button onclick="makeSquare()">Input</button>
<div id="Text"></div>

JavaScript Odd Number Sorter Coding Challenge [closed]

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Ok so I'm working on learning JavaScript and I came across a Coding Challenge question which I can not solve. It gives me the outline/skeleton of the format I should use and wants me to find the odd numbers from 1-5000.
Starting with the basic function given below, write a function called sumOddNumbers that will print to the console and return the sum of all the odd numbers from 1 to 5000. Consider using a loop, and don't forget to call the function afterwards!
~ Format ~
function sumOddNumbers() {
var sum = 0;
// Your code here
console.log(sum);
return sum;
}

There is no need for a loop:
console.log(5000**2/4);
If 5000 is a dynamic input to your function, then the formula is as follows:
function sumOddNumbers(n) {
return (n + n%2)**2/4;
}
console.log(sumOddNumbers(5000));
If really it has to be done with a loop, and according to the template (which is not very nice BTW):
function sumOddNumbers() {
var sum = 0;
for (let i = 1; i <= 5000; i+=2) {
sum += i;
}
console.log(sum);
return sum;
}
sumOddNumbers();

let sum = 0;
for (let i = 1; i < 5000; i += 2) {
sum += i;
}

let sum = 0;
for (let i = 0; i < 5000; i++) {
if (i % 2 !== 0) {
sum += i;
}
}

function sumOddNumbers(max) {
let sum = 0;
for(let i = 1; i <= max; i+=2){
sum += i;
}
console.log(sum);
return sum;
}
sumOddNumbers(5000);

How to write this piece of code in jQuery? [closed]

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I want to implement this javascript code in jquery, please!
var html = '';
for (i = 0; i < 2; i++) {
for (var j = 0; j < 7; j++) {
var num = Math.floor(Math.random()*39)+1;
html += num + ' ';
}
html += '<br>';
}
document.getElementById('rows').innerHTML = html;

There is nothing wrong with the code you posted and there is not much difference between the straight javascript version and a version written in jQuery. The only different is the last line, where you select the rows object. In jQuery you get the object using $('#rows').
Here you go:
var html = '';
for (i = 0; i < 2; i++) {
for (var j = 0; j < 7; j++) {
var num = Math.floor(Math.random()*39)+1;
html += num + ' ';
}
html += '<br>';
}
$('#rows').html(html);

How to add a variable in javascript? [closed]

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var count=0 ;
for(var x=0; x<data_len; x++)
{
count = count + num_arr[x];
}
// alert(count);
If count = 352 I want to add 3+5+2 which is 10 and then 1+0 which is 1.

function sumParts(x) {
var sumX = 0;
var strX = x.toString();
var arrX = strX.split("");
for (a = 0; a < arrX.length; a++) {
sumX += parseInt(arrX[a], 10);
};
return sumX;
}
y = sumParts(count);
z = sumParts(y);
// y = 10; (3 + 5 + 2)
// z = 1; (1 + 0)
And, I believe (untested), if the return was changed to return sumParts(sumX), it would continue until it was a single digit integer.

You have an array of strings, not numbers. You can convert them to numbers with:
count = count + +num_arr[x];
The second + is the unary plus operator, and will cast num_arr[x] to a number.
If your numbers are all integers, you can use:
count = count + parseInt(num_arr[x], 10);
or (if you have floats):
count = count + parseFloat(num_arr[x]);

Convert count into a string :
var count = 352;
count += ''; // makes a string : "352"
while (count.length > 1) {
count = Function('return ' + count.split('').join('+') + ';')() + '';
}
This part :
Function('return ' + count.split('').join('+') + ';')
Gives successively :
function () { return 3+5+2; }
function () { return 1+0; }