1 |
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2 |
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3 | const deepMap = require('../../utils/collection/deepMap')
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4 | const number = require('../../utils/number')
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5 |
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6 | function factory (type, config, load, typed) {
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7 | /**
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8 | * Test whether a value is an integer number.
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9 | * The function supports `number`, `BigNumber`, and `Fraction`.
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10 | *
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11 | * The function is evaluated element-wise in case of Array or Matrix input.
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12 | *
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13 | * Syntax:
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14 | *
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15 | * math.isInteger(x)
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16 | *
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17 | * Examples:
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18 | *
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19 | * math.isInteger(2) // returns true
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20 | * math.isInteger(0) // returns true
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21 | * math.isInteger(0.5) // returns false
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22 | * math.isInteger(math.bignumber(500)) // returns true
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23 | * math.isInteger(math.fraction(4)) // returns true
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24 | * math.isInteger('3') // returns true
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25 | * math.isInteger([3, 0.5, -2]) // returns [true, false, true]
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26 | * math.isInteger(math.complex('2-4i') // throws an error
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27 | *
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28 | * See also:
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29 | *
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30 | * isNumeric, isPositive, isNegative, isZero
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31 | *
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32 | * @param {number | BigNumber | Fraction | Array | Matrix} x Value to be tested
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33 | * @return {boolean} Returns true when `x` contains a numeric, integer value.
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34 | * Throws an error in case of an unknown data type.
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35 | */
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36 | const isInteger = typed('isInteger', {
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37 | 'number': number.isInteger, // TODO: what to do with isInteger(add(0.1, 0.2)) ?
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38 |
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39 | 'BigNumber': function (x) {
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40 | return x.isInt()
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41 | },
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42 |
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43 | 'Fraction': function (x) {
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44 | return x.d === 1 && isFinite(x.n)
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45 | },
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46 |
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47 | 'Array | Matrix': function (x) {
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48 | return deepMap(x, isInteger)
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49 | }
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50 | })
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51 |
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52 | return isInteger
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53 | }
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54 |
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55 | exports.name = 'isInteger'
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56 | exports.factory = factory
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