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Exercise 1

What does this code log to the console? Why?

let array1 = [1, 2, 3];
let array2 = array1;
array1[1] = 4;
console.log(array2);

Solution

The code outputs:

[ 1, 4, 3]

This result demonstrates that array1 and array2 reference the same array: if we change an element using array1, it also changes that element in array2. The opposite is also true: if we change an element in array2, that also changes the element in array1.

This code also demonstrates that assignment of an array to another array doesn't create a new array, but instead copies a reference from the original array (array1 above) into the target array (array2).

> array1[1] = 4
= 4

> array1
= [ 1, 4, 3 ]

> array2
= [ 1, 4, 3 ]

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