| [d24f17c] | 1 | import { values, both, complement, pipe, converge, identical, length } from 'ramda';
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| 2 | import isArray from './isArray';
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| 3 |
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| 4 | /**
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| 5 | * Checks if input value is a sparse Array.
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| 6 | * An array with at least one "empty slot" in it is often called a "sparse array."
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| 7 | * Empty slot doesn't mean that the slot contains `null` or `undefined` values,
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| 8 | * but rather that the slots don't exist.
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| 9 | *
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| 10 | * @func isSparseArray
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| 11 | * @memberOf RA
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| 12 | * @since {@link https://char0n.github.io/ramda-adjunct/2.20.0|v2.20.0}
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| 13 | * @category Type
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| 14 | * @sig * -> Boolean
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| 15 | * @param {*} list The list to test
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| 16 | * @return {boolean}
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| 17 | * @see {@link https://github.com/getify/You-Dont-Know-JS/blob/f0d591b6502c080b92e18fc470432af8144db610/types%20%26%20grammar/ch3.md#array|Sparse Arrays}, {@link RA.isArray|isArray}
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| 18 | * @example
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| 19 | *
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| 20 | * RA.isSparseArray(new Array(3)); // => true
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| 21 | * RA.isSparseArray([1,,3]); // => true
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| 22 | *
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| 23 | * const list = [1, 2, 3];
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| 24 | * delete list[1];
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| 25 | * RA.isSparseArray(list); // => true
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| 26 | *
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| 27 | * RA.isSparseArray([1, 2, 3]); // => false
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| 28 | */
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| 29 | var isSparseArray = both(isArray, converge(complement(identical), [pipe(values, length), length]));
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| 30 | export default isSparseArray; |
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