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Range in JavaScript (Sequence generator)
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// Sequence generator function (commonly referred to as "range", e.g. Clojure, PHP etc) | |
const range = (start, stop, step = 1) => Array.from({ length: (stop - start) / step + 1}, (_, i) => start + (i * step)); | |
// Generate numbers range 0..4 | |
range(0, 4); | |
// [0, 1, 2, 3, 4] | |
// Generate numbers range 1..10 with step of 2 | |
range(1, 10, 2); | |
// [1, 3, 5, 7, 9] | |
// Generate the alphabet using Array.from making use of it being ordered as a sequence | |
range('A'.charCodeAt(0), 'Z'.charCodeAt(0), 1).map(x => String.fromCharCode(x)); | |
// ["A", "B", "C", "D", "E", "F", "G", "H", "I", "J", "K", "L", "M", "N", "O", "P", "Q", "R", "S", "T", "U", "V", "W", "X", "Y", "Z"] | |
// FROM https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/from#sequence_generator_range |
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