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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);
}

Uncaught SyntaxError: missing ; after for-loop initializer, but I can't see where it's missing [closed]

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I just started learning javascript, and I want to make an online lcm hcf interactive teaching tool, but I keep getting this error pointed out below, and I can't see where it's missing
$("document").ready(function(){
function start() {
var firstNum = document.getElementById("first-num");
var secondNum = document.getElementById("second-num");
var primeList1 = [];
var primeList2 = [];
var primes = [];
var maxPrime = math.max(firstNum, secondNum) / 2 + 1;
**for (int num = 2; num < maxPrime; num++) {** <--- this line has the error
for (int i = 2; num < i; i++)
if (num % i == 0) {
break;
} else {
primes.add(num);
};
};
};

There is no int keyword in JavaScript.
You need to use var or let to declare and initialize your num and i variables
for (let num = 2; num < maxPrime; num++) {
for (let i = 2; num < i; i++)

Need to find out the average of an array [closed]

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function average(arr) {
for (i = 0; i < arr.length; i++) {
var total = 0;
total += arr[i]
}
return total / arr.length;
}
console.log(average([74, 55, 6, 35]));
It gives back the answer 8.75?
i cant see what i'm doing wrong here.

Each time you iterate you are reassigning total to 0. Move it outside of the loop.
function average(arr) {
var total = 0;
for (i = 0; i < arr.length; i++) {
total += arr[i]
}
return total / arr.length;
}

Try this
const average = (arr) => {
let total = 0;
for (i = 0; i < arr.length; i++) {
total += arr[i]
}
return total / arr.length;
}
console.log(average([74, 55, 6, 35]));

Find mode using Javascript with 2 rules based on my code [closed]

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so this is what I've achieved so far
function arrayMode(sequence) {
var arr= [];
var mostFreq = 1;
for(var i = 1; i <= 10; i++)
arr[i] = 0;
for(var i = 0 ; i < sequence.length; i++)
arr[sequence[i]]++;
for(var i = 1; i < 10; i++){
if( arr[i] > arr[mostFreq])
mostFreq = i;
}
return mostFreq;
}
so the scope for my case are
The sequence value is >= 1 and <=10
The sequence length is > 0
The sequence is an array of integer
Example 1
Input : sequence = [1, 10, 10]
Output : 10
Example 2
Input : sequence = [1, 3, 3, 3, 1]
Output : 3
It seems easy, I've tried to figure out but I cant find where is the mistake in my code, It's seems legit for me

As suggested by Maxim Krizhanovsky, the last loop should go from 1 to 10 instead of to sequence.length. Here is the working code
function arrayMode(sequence) {
var arr= [];
var mostFreq = 1;
for(var i = 0; i <= 10; i++)
arr.push(0);
for(var i = 0 ; i < sequence.length; i++)
arr[sequence[i]]++;
for(var i = 1; i <= 10; i++){
if( arr[i] > arr[mostFreq])
mostFreq = i;
}
return mostFreq;
}
The output is 10 and 3 respectively to your input.

A quite weird array [closed]

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Closed 8 years ago.
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Here is my problem, I'm programming a game and I need to use a very simple array, the problem is that I create it, everything's ok, and the next line, the values of an entire line in the array change and I don't understand why, here is my code :
var ciblesPossibles = new Array();
for (var i = 0; i < 2; i++) {
for (var j = 0; j < 5; j++) {
ciblesPossibles[i,j] = 1 + portee(i, j, ID, pos, carte.effet.portee) + duBonCote(i, ID, carte.effet.ciblesLegales);
}
console.log('1/ ciblesPossibles['+i+',x] = ' + ciblesPossibles[i,0] + ciblesPossibles[i,1] + ciblesPossibles[i,2] + ciblesPossibles[i,3] + ciblesPossibles[i,4]);
}
for (i = 0; i < 2; i++) {
console.log('2/ ciblesPossibles['+i+',x] = ' + ciblesPossibles[i,0] + ciblesPossibles[i,1] + ciblesPossibles[i,2] + ciblesPossibles[i,3] + ciblesPossibles[i,4]);
}
var max = maxTab(ciblesPossibles);
for (i = 0; i < 2; i++) {
for (j = 0; j < 5; j++) {
ciblesPossibles[i,j] = Math.floor(ciblesPossibles[i,j] / max);
console.log(ciblesPossibles[i,j]);
}
}
portee() and duBonCote() are two functions which return just 1 or 0.
When I'm at the console.log('/1...'), I have something like 33222 and 22211 (it's what I want), but when I'm at the console.log('/2...'), I have 22211 and 22211 ... What can make the first line change in my array ?
Regards

Two dimensional arrays are accessed as a[i][j], not a[i,j].
The latter will be treated as a use of the comma operator, and evaluates to just a[j], i.e. a one-dimensional matrix.
You'll be wanting something more like:
var ciblesPossibles = []; // create array to hold rows - NB: not "new Array():
for (var i = 0; i < 2; i++) {
ciblesPossibles[i] = []; // create the individual row
for (var j = 0; j < 5; j++) {
ciblesPossibles[i][j] = ...
}
}