# Changing object elements in JavaScript

Elements of objects can be changed by accessing them by keys. Let's see how it's done. Let's have the following object:

`let obj = {a: 1, b: 2, c: 3};`

Change the value of its element:

`obj['a'] = '!';`

Let's use property access:

`obj.b = '!';`

Check if the object has changed:

`console.log(obj);`

Given an object:

`let obj = {x: 1, y: 2, z: 3};`

Square each element of this object.

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