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109 lines
4.0 KiB
JavaScript
109 lines
4.0 KiB
JavaScript
import assert from 'assert'
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import math from '../../../../src/defaultInstance.js'
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describe('map', function () {
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it('should apply map to all elements of the matrix', function () {
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const m = math.matrix([[1, 2, 3], [4, 5, 6]])
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const m2 = math.map(m, function (value) { return value * 2 })
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assert.deepStrictEqual(m2.valueOf(), [[2, 4, 6], [8, 10, 12]])
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assert.ok(m2 instanceof math.Matrix)
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})
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it('should apply deep-map to all elements in the array', function () {
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const arr = [[1, 2, 3], [4, 5, 6]]
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const arr2 = math.map(arr, function (value) { return value * 2 })
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assert.deepStrictEqual(arr2, [[2, 4, 6], [8, 10, 12]])
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assert.ok(Array.isArray(arr2))
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})
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it('should invoke callback with parameters value, index, obj', function () {
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const arr = [[1, 2, 3], [4, 5, 6]]
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assert.deepStrictEqual(math.map(arr, function (value, index, obj) {
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// we don't clone index here, this should return a copy with every iteration
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return [value, index, obj === arr]
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}).valueOf(), [
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[
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[1, [0, 0], true],
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[2, [0, 1], true],
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[3, [0, 2], true]
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],
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[
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[4, [1, 0], true],
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[5, [1, 1], true],
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[6, [1, 2], true]
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]
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])
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})
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it('should invoke a typed function with correct number of arguments (1)', function () {
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const output = math.map([1, 2, 3], math.typed('callback', {
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number: function (value) {
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return value + 2
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}
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}))
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assert.deepStrictEqual(output, [3, 4, 5])
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})
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it('should invoke a typed function with correct number of arguments (2)', function () {
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const output = math.map([1, 2, 3], math.typed('callback', {
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'number, Array': function (value, index) {
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return value + 2
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}
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}))
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assert.deepStrictEqual(output, [3, 4, 5])
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})
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it('should invoke a typed function with correct number of arguments (3)', function () {
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const output = math.map([1, 2, 3], math.typed('callback', {
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'number, Array, Array': function (value, index, array) {
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return value + 2
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}
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}))
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assert.deepStrictEqual(output, [3, 4, 5])
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})
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it('should invoke a typed function with correct number of arguments (4)', function () {
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// cbrt has a syntax cbrt(x, allRoots), but it should invoke cbrt(x) here
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assert.deepStrictEqual(math.map([1, 8, 27], math.cbrt), [1, 2, 3])
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})
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it('should invoke a typed function with correct number of arguments (5)', function () {
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// cbrt has a syntax cbrt(x, allRoots), but it should invoke cbrt(x) here
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assert.deepStrictEqual(math.map([1, 8, 27], math.format), ['1', '8', '27'])
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})
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it('should throw an error if called with unsupported type', function () {
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assert.throws(function () { math.map(1, function () {}) })
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assert.throws(function () { math.map('arr', function () {}) })
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})
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it('should throw an error if called with invalid number of arguments', function () {
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assert.throws(function () { math.map([1, 2, 3]) })
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})
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it('should throw an error if the callback argument types are incorrect (1)', function () {
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assert.throws(() => math.map([1, 2, 3], math.equalText),
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/Function map cannot apply callback arguments to function equalText: Unexpected type of argument in function compareText \(expected: string or Array or Matrix, actual: number, index: 0\)/)
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})
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it('should throw an error if the callback argument types are incorrect (2)', function () {
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assert.throws(() => math.map([math.sin, 2, 3], math.sqrt),
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/TypeError: Function map cannot apply callback arguments sqrt\(value: function, index: Array, array: Array\) at index \[0]/)
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})
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it('should operate from the parser', function () {
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assert.deepStrictEqual(
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math.evaluate('map([1,2,3], square)'),
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math.matrix([1, 4, 9]))
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assert.deepStrictEqual(
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math.evaluate('map([1,2,3], f(x) = format(x))'),
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math.matrix(['1', '2', '3']))
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})
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it('should LaTeX map', function () {
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const expression = math.parse('map([1,2,3],callback)')
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assert.strictEqual(expression.toTex(), '\\mathrm{map}\\left(\\begin{bmatrix}1\\\\2\\\\3\\end{bmatrix}, callback\\right)')
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})
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})
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