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| /** | |
| * Chunk array into arrays of length at most `chunkSize` | |
| * | |
| * @param chunkSize must be greater than or equal to 1 | |
| */ | |
| export function chunk<T extends unknown[] | string>(arr: T, chunkSize: number): T[] { | |
| if (isNaN(chunkSize) || chunkSize < 1) { | |
| throw new RangeError("Invalid chunk size: " + chunkSize); | |
| } | |
| if (!arr.length) { | |
| return []; | |
| } | |
| /// Small optimization to not chunk buffers unless needed | |
| if (arr.length <= chunkSize) { | |
| return [arr]; | |
| } | |
| return range(Math.ceil(arr.length / chunkSize)).map((i) => { | |
| return arr.slice(i * chunkSize, (i + 1) * chunkSize); | |
| }) as T[]; | |
| } | |
| function range(n: number, b?: number): number[] { | |
| return b | |
| ? Array(b - n) | |
| .fill(0) | |
| .map((_, i) => n + i) | |
| : Array(n) | |
| .fill(0) | |
| .map((_, i) => i); | |
| } | |