55 lines
1.8 KiB
JavaScript
55 lines
1.8 KiB
JavaScript
import { deepMap } from '../../utils/collection.js';
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import { factory } from '../../utils/factory.js';
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import { isNegativeNumber } from '../../plain/number/index.js';
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var name = 'isNegative';
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var dependencies = ['typed'];
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export var createIsNegative = /* #__PURE__ */factory(name, dependencies, _ref => {
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var {
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typed
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} = _ref;
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/**
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* Test whether a value is negative: smaller than zero.
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* The function supports types `number`, `BigNumber`, `Fraction`, and `Unit`.
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*
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* The function is evaluated element-wise in case of Array or Matrix input.
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*
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* Syntax:
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*
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* math.isNegative(x)
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*
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* Examples:
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*
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* math.isNegative(3) // returns false
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* math.isNegative(-2) // returns true
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* math.isNegative(0) // returns false
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* math.isNegative(-0) // returns false
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* math.isNegative(math.bignumber(2)) // returns false
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* math.isNegative(math.fraction(-2, 5)) // returns true
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* math.isNegative('-2') // returns true
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* math.isNegative([2, 0, -3]') // returns [false, false, true]
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*
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* See also:
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*
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* isNumeric, isPositive, isZero, isInteger
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*
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* @param {number | BigNumber | Fraction | Unit | Array | Matrix} x Value to be tested
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* @return {boolean} Returns true when `x` is larger than zero.
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* Throws an error in case of an unknown data type.
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*/
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return typed(name, {
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number: isNegativeNumber,
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BigNumber: function BigNumber(x) {
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return x.isNeg() && !x.isZero() && !x.isNaN();
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},
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Fraction: function Fraction(x) {
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return x.s < 0; // It's enough to decide on the sign
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},
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Unit: function Unit(x) {
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return this(x.value);
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},
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'Array | Matrix': function ArrayMatrix(x) {
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return deepMap(x, this);
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}
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});
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}); |