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Array in each position successively Javascript [closed]

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I've got trouble with arrays. I'm trying to iterate elements for each position in the array using javascript.
so, I need to do that on the first position, be a value [1]. On the second position, [2, 3, 4]. on the third position, [5,6,7,8,9] and successively two by two.
My attempt was did a for loop:
for (let i = 1; i <= 5; i++) {
for (let j = 1; j <= 5; j++) {
console.log(`${i} ${j}`)
}
}
But while looping, the indices (i) repeat with (j).
What to do?

Try this code.
var counting = 1;
for (let i = 1; i <= 5; i = i + 2) {
var str = "";
for (let j = 1; j <= i; j++) {
str += `${counting} `;
counting++;
}
console.log(str);
}

How to loop randomize javascript function in html [closed]

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Closed 2 years ago.
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I know this is very simple question, but I don't know why it only giving same output.
I'm trying to randomize 4 numbers from 1 to 100
I'm very new to javascript
this is my code:
function myFunction() {
var text = "",
i;
var x = Math.floor((Math.random() * 100) + 1);
for (i = 1; i <= 4; i++) {
text += " number " + x;
}
document.getElementById("rand").innerHTML = text;
}
<button onclick="myFunction()">Generate</button>
<p id="rand"></p>

You are calling your randomize part of code outside the for loop. It should be recalculated on every step of the loop. Something like this
function myFunction() {
var text = "",
i;
for (i = 1; i <= 4; i++) {
var x = Math.floor((Math.random() * 100) + 1);
text += " number " + x;
}
document.getElementById("rand").innerHTML = text;
}
<button onclick="myFunction()">Generate</button>
<p id="rand"></p>

function myFunction() {
var text = "";
var i = 0;
randNos = [];
while(i<4) {
x = rand();
if(randNos.indexOf(x) === -1) {
text += " number " + x ;
randNos.push(x);
i++
}
}
document.getElementById("rand").innerHTML = text;
}
function rand() {
return Math.floor((Math.random() * 100) + 1);
}
You were trying to print the same random no 4 times. You just need to move your random no line inside the loop

How to add spaces to for loop output in javascript? [closed]

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I want to add one space in between each outcome in this for loop,
for (var i = -52; i <= 1066; i++) {
document.write(i)
}

You can add to do it
for (var i = -52; i <= 1066; i++) {
document.write(i+" ");
}
Or just add to space in the write
for (var i = -52; i <= 1066; i++) {
document.write(i+" ");
}

this should help you out.
for (var i = -52; i <= 1066; i++) {
document.write(' ' + i)
}
or
for (var i = -52; i <= 1066; i++) {
document.write(' ' + i)
}

Browsers are designed to ignore whitespace such as spaces, typing in multiple ' ' (spaces) will be reduced to a single space. If you're looking to add multiple spaces in Javascript the easiest way is to use &nbsp. Such tags are called entities and numerous characters can be printed using entities. More can be found here
for(var i = 0;i < n;i++)
{
document.write("&nbsp")
}

for (var i = 52; i <= 1066; i++) {
document.write(i+'\t') }

Try this:
let result = [];
for (let i = -52; i <= 1066; i++) {
result.push(i);
}
document.write(result.join(" "));
Suggestion: avoid using document.write at best, especially in a big for loop.

Reverse a sentence and print each word in reverse order in Javascript [closed]

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I'm making a JavaScript program where if a user inputs a sting such as
"i love my country"
the output will produce:
country
my
love
i
I have tried using split function but not getting the required output.
<script language="javascript">
var n, x, i, j;
rev = "";
n = window.prompt("enter any string");
x = n.split(" ");
for (i = 0; i < x.length; i++) {
for (j = x[i].length() - 1; j >= 0; j--) {
document.writeln(x[i].charAt(j));
document.write(rev);
}
}
</script>

Try using Array.prototype.reverse() , Array.prototype.join()
var str = "I LOVE MY COUNTRY";
console.log(str.split(/\s/).reverse().join(" "));
Remove () at j = x[i].length() ; .length is not a function ; adding document.write("<br>") below inner for loop to include <br> tag in output after each iteration of i to place line break in html following a word entered at prompt . E.g., try input of "I love my country" at prompt() at stacksnippets
var n, x, i, j;
rev = "";
n = window.prompt("enter any string");
x = n.split(" ");
for (i = 0; i < x.length; i++) {
for (j = x[i].length - 1; j >= 0; j--) {
document.writeln(x[i].charAt(j));
}
document.write("<br>")
}

try this code
var str = "SAMPLE STRING";
alert( str.split( "\\s+" ).reverse.join ( " " ) );
alert( str.split( " " ).reverse.join ( " " ) );
Since you want to print in a new line
var str = "SAMPLE STRING";
alert( str.split( " " ).reverse.join ( "\n" ) );

var str = "SAMPLE STRING";
var arr = str.split(" ");
arr.reverse();
str = arr.join(" ");

a = "SAMPLE STRING"
a.split(" ").reverse().forEach(function(element) {
document.writeln(element);
document.write('<br />')
})
OUTPUT:
STRING
SAMPLE
JSFiddle

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);