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| 1 | import { curryN } from 'ramda';
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| 2 |
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| 3 | import isInteger32 from './isInteger32';
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| 4 |
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| 5 | /**
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| 6 | * Checks whether the passed value is {@link https://github.com/getify/You-Dont-Know-JS/blob/9959fc904d584bbf0b02cf41c192f74ff4238581/types-grammar/ch4.md#the-curious-case-of-the-|a sentinel value}.
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| 7 | *
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| 8 | * @func isSentinelValue
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| 9 | * @memberOf RA
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| 10 | * @since {@link https://char0n.github.io/ramda-adjunct/2.33.0|v2.33.0}
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| 11 | * @category Type
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| 12 | * @sig * -> Boolean
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| 13 | * @param {*} val The value to test
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| 14 | * @return {boolean}
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| 15 | * @example
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| 16 | *
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| 17 | * RA.isSentinelValue(-1); //=> true
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| 18 | *
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| 19 | * RA.isSentinelValue('-1'); //=> false
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| 20 | * RA.isSentinelValue(1); //=> false
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| 21 | * RA.isSentinelValue([-1]); //=> false
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| 22 | */
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| 23 | // eslint-disable-next-line no-bitwise
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| 24 | const isSentinelValue = curryN(1, (val) => isInteger32(val) && ~val === 0);
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| 25 |
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| 26 | export default isSentinelValue;
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