Array.prototype.concat() (3 arrays) - JavaScript | MDN

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Wed Nov 11 2020 04:10:50 GMT+0000 (Coordinated Universal Time)

const num1 = [1, 2, 3];
const num2 = [4, 5, 6];
const num3 = [7, 8, 9];

const numbers = num1.concat(num2, num3);

console.log(numbers); 
// results in [1, 2, 3, 4, 5, 6, 7, 8, 9]

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https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/concat

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Array.prototype.concat() (3 arrays) - JavaScript | MDN

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