10 lines
220 B
TypeScript
10 lines
220 B
TypeScript
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interface Array<T> {
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flatMap<E>(callback: (t: T) => Array<E>): Array<E>;
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}
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Array.prototype.flatMap = function (f: Function) {
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return this.reduce((ys: any, x: any) => {
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return ys.concat(f.call(this, x));
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}, []);
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};
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