mirror of
https://github.com/josdejong/mathjs.git
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51 lines
1.6 KiB
JavaScript
51 lines
1.6 KiB
JavaScript
'use strict'
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const flatten = require('../../utils/array').flatten
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function factory (type, config, load, typed) {
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const MatrixIndex = load(require('../../type/matrix/MatrixIndex'))
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const concat = load(require('../matrix/concat'))
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const size = load(require('../matrix/size'))
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const subset = load(require('../matrix/subset'))
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const setDifference = load(require('../set/setDifference'))
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/**
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* Create the symmetric difference of two (multi)sets.
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* Multi-dimension arrays will be converted to single-dimension arrays before the operation.
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*
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* Syntax:
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*
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* math.setSymDifference(set1, set2)
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*
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* Examples:
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*
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* math.setSymDifference([1, 2, 3, 4], [3, 4, 5, 6]) // returns [1, 2, 5, 6]
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* math.setSymDifference([[1, 2], [3, 4]], [[3, 4], [5, 6]]) // returns [1, 2, 5, 6]
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*
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* See also:
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*
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* setUnion, setIntersect, setDifference
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*
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* @param {Array | Matrix} a1 A (multi)set
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* @param {Array | Matrix} a2 A (multi)set
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* @return {Array | Matrix} The symmetric difference of two (multi)sets
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*/
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const setSymDifference = typed('setSymDifference', {
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'Array | Matrix, Array | Matrix': function (a1, a2) {
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if (subset(size(a1), new MatrixIndex(0)) === 0) { // if any of them is empty, return the other one
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return flatten(a2)
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} else if (subset(size(a2), new MatrixIndex(0)) === 0) {
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return flatten(a1)
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}
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const b1 = flatten(a1)
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const b2 = flatten(a2)
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return concat(setDifference(b1, b2), setDifference(b2, b1))
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}
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})
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return setSymDifference
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}
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exports.name = 'setSymDifference'
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exports.factory = factory
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