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on this file was d24f17c, checked in by Aleksandar Panovski <apano77@…>, 15 months ago |
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File size:
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| 1 | import {
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| 2 | curry,
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| 3 | addIndex,
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| 4 | filter,
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| 5 | pipe,
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| 6 | modulo,
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| 7 | identical,
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| 8 | nthArg,
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| 9 | __,
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| 10 | } from 'ramda';
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| 11 |
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| 12 | /**
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| 13 | * When given a number n and an array, returns an array containing every nth element.
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| 14 | *
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| 15 | * @func skipTake
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| 16 | * @memberOf RA
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| 17 | * @category List
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| 18 | * @since {@link https://char0n.github.io/ramda-adjunct/2.26.0|v2.26.0}
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| 19 | * @sig Number -> [a] -> [a]
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| 20 | * @param {number} the nth element to extract
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| 21 | * @param {Array} value the input array
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| 22 | * @return {Array} An array containing every nth element
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| 23 | * @example
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| 24 | *
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| 25 | * RA.skipTake(2, [1,2,3,4]) //=> [1, 3]
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| 26 | * RA.skipTake(3, R.range(0, 20)); //=> [0, 3, 6, 9, 12, 15, 18]
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| 27 | */
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| 28 |
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| 29 | const skipTake = curry((n, list) =>
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| 30 | addIndex(filter)(pipe(nthArg(1), modulo(__, n), identical(0)))(list)
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| 31 | );
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| 32 |
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| 33 | export default skipTake;
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