1.2 KiB
1.2 KiB
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Spread Operator |
Spread Operator
The spread operator (...
), allows to get the elements of a collection.
One of the most common uses is for Node
Objects, when using query selectors in the browser, in order to make them iterable Array Objects:
const paragraphs = document.querySelectorAll('p.paragraph');
const arr = [...paragraphs];
Another use of the spread operator is for Array concatenation:
const arr_1 = [1, 2, 3, 4]
const arr_2 = [5, 6, 7, 8]
const arr_final = [...arr_1, ...arr_2]
// arr_final = [1, 2, 3, 4, 5, 6, 7, 8]
Spread operator can be used to copy an Array.
const arr_3 = [1, 2, 3, 4]
const reference = arr_3
const copy = [...arr_3]
copy.push(5)
// arr_3 = [1, 2, 3, 4]
// copy = [1, 2, 3, 4, 5]
The spread operator can also copy enumerable properties from one or more objects onto a new object:
```javascript
const obj1 = {
a: 1,
b: 2,
c: 3
};
const obj2 = {
d: 4,
e: 5,
f: 6
};
const newObj = {...obj1, ...obj2);
// newObj = { a: 1, b: 2, c: 3, d: 4, e: 5, f: 6 }