Several common methods of combining and combining numbers in JS

There are many ways to combine multiple arrays into one array in JS.

1. Use the () merge: the concat() method to combine multiple numbers into a new array.

let arr1 = [1, 2, 3];
let arr2 = [4, 5, 6];
let arr3 = [7, 8, 9];
let mergedArr = (arr2, arr3);
(mergedArr);  // [1, 2, 3, 4, 5, 6, 7, 8, 9]

2. Use the extension operator (...) Merge: The extension operator can combine multiple numbers into a new array.

let arr1 = [1, 2, 3];
let arr2 = [4, 5, 6];
let arr3 = [7, 8, 9];
let mergedArr = [...arr1, ...arr2, ...arr3];
(mergedArr);  // [1, 2, 3, 4, 5, 6, 7, 8, 9]

3. Use the () merge: () method to combine multiple numbers into a new array.

let arr1 = [1, 2, 3];
let arr2 = [4, 5, 6];
let arr3 = [7, 8, 9];
let mergedArr = [].([], [arr1, arr2, arr3]);
(mergedArr);  // [1, 2, 3, 4, 5, 6, 7, 8, 9]

4. Merge using (): The reduce() function can be used to build a new array and add multiple array elements to the new array.

let arr1 = [1, 2, 3];
let arr2 = [4, 5, 6];
let arr3 = [7, 8, 9];
let mergedArr = [arr1, arr2, arr3].reduce((acc, cur) => (cur), []);
(mergedArr);  // [1, 2, 3, 4, 5, 6, 7, 8, 9]

5. Use () Merge: the forEach() method can traverse multiple arrays and add elements to the new array.

let arr1 = [1, 2, 3];
let arr2 = [4, 5, 6];
let arr3 = [7, 8, 9];
let mergedArr = [];
[arr1, arr2, arr3].forEach(function(array) {
    (function(element) {
        (element);
    });
});
(mergedArr);  // [1, 2, 3, 4, 5, 6, 7, 8, 9]

6. Merge using the concat() of the third-party library lodash

7. Merge using the third-party library Ramda's concat()

Summarize

This is the end of this article about several common methods of combining arrays in JS. For more related JS, please search for my previous articles or continue browsing the related articles below. I hope you will support me in the future!