let arr = [];
console.log(arr.push([])); // 1
Instead of logging [[]], the output is 1. Can someone explain what is happening in the code above?
let arr = [];
console.log(arr.push([])); // 1
Instead of logging [[]], the output is 1. Can someone explain what is happening in the code above?
As stated by MDN, when using the Array#push method, it will return the new length property of the object that the method was called on.
Therefore, when pushing an element to an empty array, the length will be incremented by 1 resulting in a length of 1.
If you want to verify this behavior, consider the following code snippet:
// Empty array.
var arr = [];
// Pushing an item: result = 1
console.log(arr.push([]));
// Pushing another item: result = 2
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