maher
27 lines
576 B
TypeScript
Executable File
27 lines
576 B
TypeScript
Executable File
interface Options<T> {
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map?: (item: T) => T;
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}
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export function groupArrayBy<T>(
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arr: T[],
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cb: (item: any) => string,
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options?: Options<T>,
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): {[key: string]: T[]} {
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const result: {[key: string]: T[]} = {};
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for (let i = 0; i < arr.length; i++) {
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let item = arr[i];
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const bucketCategory = cb(item);
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const bucket = result[bucketCategory];
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item = options?.map ? options.map(arr[i]) : arr[i];
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if (!Array.isArray(bucket)) {
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result[bucketCategory] = [item];
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} else {
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result[bucketCategory].push(item);
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}
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}
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return result;
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}
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