Jan 25, 2012 · You're always pushing a reference to the same array into your super-array. To solve that problem, you can use slice () to clone the sub-array before pushing it: var sub_array = []; var super_array = []; for (var i = 1; i <= 3; i++) { sub_array.push(i); super_array.push(sub_array.slice(0)); alert(super_array);

Apr 13, 2016 · Move the object declaration inside the loop to create a new object in each iteration. var obj = {}; // <---- Move declaration inside loop. obj['data'] = fruits[i]; obj['label'] = label; arr.push(obj); A simple way to avoid this is using Array#map to create new array from old. data: fruit, label: label. You are always overwriting the same object.

Feb 1, 2024 · JavaScript allows us to push an object into an array using a for-loop. This process consists of iterating over the sequence of values or indices using the for-loop and using an array manipulation method like push (), to append new elements to the array.

You need to change your for loop from i <= data.length to i < data.length. This will ensure that the i variable will always be within the bounds of the array. Considering that the index is zero-based, but the length will count up from one, the length will always be one more than the highest index. Here is my dummy explanation. If for example:

Jul 12, 2024 · Use a for loop to iterate over the desired number of elements, adding each one to the array using the push () method. Syntax: arrayNumbers.push(items); Example: In the given example, we are creating an array of even numbers from 1 to 10 using a for a loop.

Aug 21, 2020 · In order by the most easiest, the first method is .map (); We need to create a new variable, take our array, and the return which value we need to push into this new variable:

Mar 21, 2022 · To push the object to an array in JavaScript for loop push, you have to create a new object in each iteration. When creating a new object using the key and value. var arr = []; for(var i = 0; i < 5; i++){ arr.push({valueItem: 'item'+i}); } console.log(arr)

Sep 10, 2018 · Yes, it is an infinte loop. Everytime you push a new element into the array, its length increases by 1. So when the loop condition i<arr.length is re-assessed, it never evaluates to false, thus causing an infinite loop. You should use a condition which doesn’t change when you push an element.

Apr 15, 2025 · The for…of loop is a modern way to loop through arrays in JavaScript. It iterates directly over the values of the array, which makes the syntax more concise and easier to understand compared to the traditional for loop.

Jan 17, 2020 · I have been trying to push an array of 3 values to an array to create an AOA. However my expected output is not coming out correct. Input data looks something like the following [ {id:xxxxx, date: