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Concatenating variable number of arrays into one - JavaScript
We are required to write a JavaScript function that takes in any number of JavaScript arrays and returns one single array with all the values from input arrays concatenated into it.
For example − If the input arrays are −
[1, 5], [44, 67, 3], [2, 5], [7], [4], [3, 7], [6]
Then the output should be −
const output = [1, 5, 44, 67, 3, 2, 5, 7, 4, 3, 7, 6];
Example
Following is the code −
const a = [1, 5], b = [44, 67, 3], c = [2, 5], d = [7], e = [4], f = [3,
7], g = [6];
const concatArrays = (...arr) => {
const res = arr.reduce((acc, val) => {
return acc.concat(...val);
}, []);
return res;
};
console.log(concatArrays(a, b, c, d, e, f, g));Output
Following is the output in the console −
[ 1, 5, 44, 67, 3, 2, 5, 7, 4, 3, 7, 6 ]
Updated on: 16-Sep-2020
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