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- const arr1 = ["a","b","c"];
- const arr2 = ["d","e","f"];
- const arr3 = ["g","h","i"];
- // Array.prototype.concat()
- const arrayConcat = arr1.concat(arr2).concat(arr3);
- // Array.prototype.push() + spread operator
- const arrayPush = [];
- arrayPush.push(...arr1, ...arr2, ...arr3);
- // Array constructor + spread operator
- const arrayConstructor = Array(...arr1, ...arr2, ...arr3);
- // Array constructor + Array.prototype.flat()
- const flatArrayConstructor = Array(arr1, arr2, arr3).flat();
- // Array.of + spread operator
- const arrayOf = Array.of(...arr1, ...arr2, ...arr3);
- // Array.of + Array.prototype.flat
- const flatArrayOf = Array.of(arr1, arr2, arr3).flat();
- // Spread Operator
- const arraySpread = [...arr1, ...arr2, ...arr3];
- // Array.prototype.flat
- const flatArraySpread = [arr1, arr2, arr3].flat();
- console.log({
- arrayConcat,
- arrayPush,
- arrayConstructor,
- flatArrayConstructor,
- arrayOf,
- flatArrayOf,
- arraySpread,
- flatArraySpread
- });
- // {arrayConcat: Array(9), arrayPush: Array(9), arrayConstructor: Array(9), flatArrayConstructor: Array(9), arrayOf: Array(9), …}
- // arrayConcat: (9) ["a", "b", "c", "d", "e", "f", "g", "h", "i"]
- // arrayConstructor: (9) ["a", "b", "c", "d", "e", "f", "g", "h", "i"]
- // arrayOf: (9) ["a", "b", "c", "d", "e", "f", "g", "h", "i"]
- // arrayPush: (9) ["a", "b", "c", "d", "e", "f", "g", "h", "i"]
- // arraySpread: (9) ["a", "b", "c", "d", "e", "f", "g", "h", "i"]
- // flatArrayConstructor: (9) ["a", "b", "c", "d", "e", "f", "g", "h", "i"]
- // flatArrayOf: (9) ["a", "b", "c", "d", "e", "f", "g", "h", "i"]
- // flatArraySpread: (9) ["a", "b", "c", "d", "e", "f", "g", "h", "i"]
- // proof of immutability
- console.log({
- arr1,
- arr2,
- arr3
- });
- // {arr1: Array(3), arr2: Array(3), arr3: Array(3)}
- // arr1: (3) ["a", "b", "c"]
- // arr2: (3) ["d", "e", "f"]
- // arr3: (3) ["g", "h", "i"]
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