75 lines
2.5 KiB
JavaScript
75 lines
2.5 KiB
JavaScript
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// Fractions
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// load math.js (using node.js)
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const { create, all } = require('..')
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// configure the default type of numbers as Fractions
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const config = {
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// Default type of number
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// Available options: 'number' (default), 'BigNumber', or 'Fraction'
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number: 'Fraction'
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}
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// create a mathjs instance with everything included
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const math = create(all, config)
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console.log('basic usage')
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printRatio(math.fraction(0.125)) // Fraction, 1/8
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printRatio(math.fraction(0.32)) // Fraction, 8/25
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printRatio(math.fraction('1/3')) // Fraction, 1/3
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printRatio(math.fraction('0.(3)')) // Fraction, 1/3
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printRatio(math.fraction(2, 3)) // Fraction, 2/3
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printRatio(math.fraction('0.(285714)')) // Fraction, 2/7
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console.log()
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console.log('round-off errors with numbers')
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print(math.add(0.1, 0.2)) // number, 0.30000000000000004
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print(math.divide(0.3, 0.2)) // number, 1.4999999999999998
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console.log()
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console.log('no round-off errors with fractions :)')
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print(math.add(math.fraction(0.1), math.fraction(0.2))) // Fraction, 0.3
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print(math.divide(math.fraction(0.3), math.fraction(0.2))) // Fraction, 1.5
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console.log()
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console.log('represent an infinite number of repeating digits')
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print(math.fraction('1/3')) // Fraction, 0.(3)
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print(math.fraction('2/7')) // Fraction, 0.(285714)
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print(math.fraction('23/11')) // Fraction, 2.(09)
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console.log()
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// one can work conveniently with fractions using the expression parser.
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// note though that Fractions are only supported by basic arithmetic functions
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console.log('use fractions in the expression parser')
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printRatio(math.evaluate('0.1 + 0.2')) // Fraction, 3/10
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printRatio(math.evaluate('0.3 / 0.2')) // Fraction, 3/2
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printRatio(math.evaluate('23 / 11')) // Fraction, 23/11
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console.log()
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// output formatting
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console.log('output formatting of fractions')
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const a = math.fraction('2/3')
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console.log(math.format(a)) // Fraction, 2/3
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console.log(math.format(a, { fraction: 'ratio' })) // Fraction, 2/3
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console.log(math.format(a, { fraction: 'decimal' })) // Fraction, 0.(6)
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console.log(a.toString()) // Fraction, 0.(6)
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console.log()
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/**
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* Helper function to output a value in the console.
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* Fractions will be formatted as ratio, like '1/3'.
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* @param {*} value
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*/
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function printRatio (value) {
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console.log(math.format(value, { fraction: 'ratio' }))
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}
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/**
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* Helper function to output a value in the console.
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* Fractions will be formatted as decimal, like '0.(3)'.
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* @param {*} value
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*/
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function print (value) {
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console.log(math.format(value, { fraction: 'decimal' }))
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}
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