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Create a range of numbers
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const range = (options) => { | |
const { from = 0, step = 1, to } = options; | |
if (!to) { | |
throw Error('"to" must be specified'); | |
} | |
if (to <= from) { | |
throw Error(`"to (${to})" is lesser than or equal to "from (${from})"`); | |
} | |
return Array.from( | |
{ length: Math.ceil((to - from) / step) }, | |
(_, i) => i * step + from | |
); | |
}; | |
// Usage | |
const r1 = range({ to: 10 }); | |
// [0, 1, 2, 3, 4, 5, 6, 7, 8, 9] | |
const r2 = range({ from: 10, to: 20 }); | |
// [10, 11, 12, 13, 14, 15, 16, 17, 18, 19] | |
const r3 = range({ from: 10, to: 20, step: 3 }); | |
// [10, 13, 16, 19] |
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