mirror of
https://github.com/josdejong/mathjs.git
synced 2025-12-08 19:46:04 +00:00
63 lines
2.8 KiB
JavaScript
63 lines
2.8 KiB
JavaScript
import assert from 'assert'
|
|
import math from '../../../../src/bundleAny'
|
|
const permutations = math.permutations
|
|
|
|
describe('permutations', function () {
|
|
it('should calculate the permutations of a number', function () {
|
|
assert.strictEqual(permutations(0), 1)
|
|
assert.strictEqual(permutations(1), 1)
|
|
assert.strictEqual(permutations(2), 2)
|
|
assert.strictEqual(permutations(3), 6)
|
|
assert.strictEqual(permutations(4), 24)
|
|
assert.strictEqual(permutations(5), 120)
|
|
})
|
|
|
|
it('should calculate the permutations of a BigNumber', function () {
|
|
assert.deepStrictEqual(permutations(math.bignumber(4)), math.bignumber(24))
|
|
assert.deepStrictEqual(permutations(math.bignumber(5)), math.bignumber(120))
|
|
assert.deepStrictEqual(permutations(math.bignumber(8)), math.bignumber(40320))
|
|
})
|
|
|
|
it('should calculate the permutations of a BigNumber, taking k at a time', function () {
|
|
assert.deepStrictEqual(permutations(math.bignumber(5), math.bignumber(4)), math.bignumber(120))
|
|
assert.deepStrictEqual(permutations(math.bignumber(6), math.bignumber(3)), math.bignumber(120))
|
|
assert.deepStrictEqual(permutations(math.bignumber(9), math.bignumber(8)), math.bignumber(362880))
|
|
})
|
|
|
|
it('should calculate the permutations of a number, taking k at a time', function () {
|
|
assert.strictEqual(permutations(5, 4), 120)
|
|
assert.strictEqual(permutations(9, 8), 362880)
|
|
assert.strictEqual(permutations(7, 5), 2520)
|
|
})
|
|
|
|
it('should fail loudly when k is larger than x', function () {
|
|
assert.throws(function () { permutations(5, 6) }, TypeError)
|
|
assert.throws(function () { permutations(math.bignumber(5), math.bignumber(6)) }, TypeError)
|
|
})
|
|
|
|
it('should not accept negative or non-integer arguments', function () {
|
|
assert.throws(function () { permutations(12, -6) }, TypeError)
|
|
assert.throws(function () { permutations(-12, 6) }, TypeError)
|
|
assert.throws(function () { permutations(4.5, 2) }, TypeError)
|
|
assert.throws(function () { permutations(4, 0.5) }, TypeError)
|
|
assert.throws(function () { permutations(math.bignumber(-12), -6) }, TypeError)
|
|
assert.throws(function () { permutations(math.bignumber(12.5), math.bignumber(6)) }, TypeError)
|
|
assert.throws(function () { permutations(math.bignumber(12.5), math.pi) }, TypeError)
|
|
})
|
|
|
|
it('should not accept more than two arguments', function () {
|
|
assert.throws(function () { permutations(12, 6, 13) })
|
|
assert.throws(function () { permutations(-12, 6, 13) })
|
|
})
|
|
|
|
it('should not accept arguments of the wrong type', function () {
|
|
assert.throws(function () { permutations('baa baa black sheep', true) })
|
|
assert.throws(function () { permutations(new Array(12)) })
|
|
})
|
|
|
|
it('should LaTeX permutations', function () {
|
|
const expression = math.parse('permutations(2)')
|
|
assert.strictEqual(expression.toTex(), '\\mathrm{permutations}\\left(2\\right)')
|
|
})
|
|
})
|