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June 9, 2020 09:45
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| /* | |
| Implement the array flat function. | |
| https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/flat | |
| Creates a new array with all sub-array elements concatenated into it recursively up to the specified depth. | |
| var arr1 = [1, 2, [3, 4]]; | |
| arr1.flat(); // [1, 2, 3, 4] | |
| var arr2 = [1, 2, [3, 4, [5, 6]]]; | |
| arr2.flat(); // [1, 2, 3, 4, [5, 6]] | |
| var arr3 = [1, 2, [3, 4, [5, 6]]]; | |
| arr3.flat(2); // [1, 2, 3, 4, 5, 6] | |
| var arr4 = [1, 2, [3, 4, [5, 6, [7, 8, [9, 10]]]]]; | |
| arr4.flat(Infinity); // [1, 2, 3, 4, 5, 6, 7, 8, 9, 10] | |
| Extension: remove empty slots in flattened arrays | |
| var arr5 = [1, 2, , 4, 5]; | |
| arr5.flat(); // [1, 2, 4, 5] | |
| var arr6 = [1, 2, , [4, ,5]]; | |
| arr6.flat(); // [1, 2, [4, ,5]] | |
| */ | |
| Array.prototype.flat = function customFlat(dept = Infinity) { | |
| const arr = this; | |
| return this.reduce((acc, curr) => { | |
| if(dept > 0 && Array.isArray(curr)){ | |
| dept--; | |
| return [...acc, ...customFlat.call(curr, dept)] | |
| } | |
| return [...acc, curr] | |
| }, []); | |
| } | |
| console.log([1, 2, [3, 4, [5, 6, [7, 8, [9, 10]]]]].flat()); |
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