Created
May 26, 2019 10:27
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Array flat map method
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| // Without .flatMap() | |
| var arr1 = [1, 2, 3, 4]; | |
| arr1.map(x => [x * 2]); | |
| // [[2], [4], [6], [8]] | |
| arr1.map(x => [x * 2]).flat(); | |
| // [2,4,6,8] | |
| // With .flatMap() => it is faster than above method | |
| arr1.flatMap(x => [x * 2]); | |
| // [2, 4, 6, 8] | |
| // only one level is flattened | |
| arr1.flatMap(x => [[x * 2]]); | |
| // [[2], [4], [6], [8]] |
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