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range ​

Problem ​

You need to generate a sequence of integers without mutation — for example creating index arrays, building pagination controls, or driving Array.from.

Solution ​

Use range(stop), range(start, stop), or range(start, stop, step) to produce an integer array.

ts
import { range } from '@vielzeug/arsenal';

range(5); // [0, 1, 2, 3, 4]
range(1, 6); // [1, 2, 3, 4, 5]
range(0, 10, 2); // [0, 2, 4, 6, 8]
range(5, 0, -1); // [5, 4, 3, 2, 1]

Pitfalls ​

  • stop is exclusive. range(1, 5) returns [1, 2, 3, 4], not [1, 2, 3, 4, 5].