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Implement _.range(start, end, step) generator

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01

Understand the problem

Create range that generates numbers from start to end (exclusive) with step. Support single arg (0..end) and negative steps.

rangearrayutility
02

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03

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Approach: Normalize args, loop with step.

function range(start, end, step = 1) {
  if (end === undefined) { end = start; start = 0; }
  if (step === 0) throw new Error('step cannot be 0');
  const res = [];
  if (step > 0) for (let i=start; i<end; i+=step) res.push(i);
  else for (let i=start; i>en

Solution ready — 2 min read

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