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map.test.ts
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map.test.ts
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import * as map from './map.ts'
import { describe, it } from 'node:test'
import * as assert from 'assert'
describe('map', () => {
describe('pop', () => {
it('should remove the key and return the value', () => {
const xs = new Map()
xs.set('test', 1)
const result = map.pop('test')(xs)
assert.equal(xs.size, 0)
assert.equal(result, 1)
})
it('should return undefined and not affect the map if the key does not exist in it', () => {
const xs = new Map()
xs.set('test', 1)
const result = map.pop('random')(xs)
assert.equal(xs.size, 1)
assert.equal(result, undefined)
})
})
describe('set', () => {
it('should update a map in place and return it', () => {
const xs = new Map()
assert.equal(
map.set('test')(1)(xs),
xs
)
assert.equal(xs.size, 1)
assert.deepEqual(Array.from(xs), [['test', 1]])
})
})
describe('of', () => {
it('should return map of any iterable of duad', () => {
const result = map.of([['test', 1], ['best', 2]])
assert.equal(result.constructor, Map)
assert.equal(result.size, 2)
assert.equal(result.get('test'), 1)
assert.equal(result.get('best'), 2)
})
})
describe('ofV', () => {
it('should return map of values, keys provided by function', () => {
const result = map.ofV(x => x+'')([1,2,3])
assert.equal(result.constructor, Map)
assert.equal(result.size, 3)
assert.equal(result.get('1'), 1)
assert.equal(result.get('2'), 2)
assert.equal(result.get('3'), 3)
})
})
describe('ofVN', () => {
it('should create recursive maps', () => {
type Entry = {
test: number;
best: string;
rest: boolean;
}
const xs = [
{ test: 1, best: 'a', rest: true },
{ test: 1, best: 'a', rest: false },
{ test: 2, best: 'a', rest: true },
{ test: 2, best: 'a', rest: false },
{ test: 1, best: 'b', rest: true },
{ test: 1, best: 'b', rest: false },
{ test: 2, best: 'b', rest: true },
{ test: 2, best: 'b', rest: false },
];
const result = map.ofVN((x: Entry) => x.test, (x: Entry) => x.best, (x: Entry) => x.rest)(xs);
assert.deepEqual(Array.from(result).map(x => [x[0], Array.from(x[1]).map(x => [x[0], Array.from(x[1])])]), [
[1, [
['a', [
[true, { test: 1, best: 'a', rest: true }],
[false, { test: 1, best: 'a', rest: false }],
]],
['b', [
[true, { test: 1, best: 'b', rest: true }],
[false, { test: 1, best: 'b', rest: false }],
]]
]],
[2, [
['a', [
[true, { test: 2, best: 'a', rest: true }],
[false, { test: 2, best: 'a', rest: false }],
]],
['b', [
[true, { test: 2, best: 'b', rest: true }],
[false, { test: 2, best: 'b', rest: false }],
]]
]],
]);
})
})
describe('groupBy', () => {
it('should group values with keys provided by function', () => {
const xs = [
{ test: 1, best: 'a' },
{ test: 2, best: 'a' },
{ test: 1, best: 'b' },
{ test: 2, best: 'b' },
]
const result = map.groupBy((x: { test: number }) => x.test)(xs)
assert.deepEqual(Array.from(result), [
[1, [
{ test: 1, best: 'a' },
{ test: 1, best: 'b' },
]],
[2, [
{ test: 2, best: 'a' },
{ test: 2, best: 'b' },
]],
])
})
})
describe('groupByN', () => {
it('should recursively group values', () => {
type Entry = {
test: number;
best: string;
rest: boolean;
}
const xs = [
{ test: 1, best: 'a', rest: true },
{ test: 1, best: 'a', rest: false },
{ test: 2, best: 'a', rest: true },
{ test: 2, best: 'a', rest: false },
{ test: 1, best: 'b', rest: true },
{ test: 1, best: 'b', rest: false },
{ test: 2, best: 'b', rest: true },
{ test: 2, best: 'b', rest: false },
]
const result = map.groupByN((x: Entry) => x.test, (x: Entry) => x.best)(xs)
assert.deepEqual(Array.from(result).map(x => [x[0], Array.from(x[1])]), [
[1, [
['a', [
{ test: 1, best: 'a', rest: true },
{ test: 1, best: 'a', rest: false },
]],
['b', [
{ test: 1, best: 'b', rest: true },
{ test: 1, best: 'b', rest: false },
]]
]],
[2, [
['a', [
{ test: 2, best: 'a', rest: true },
{ test: 2, best: 'a', rest: false },
]],
['b', [
{ test: 2, best: 'b', rest: true },
{ test: 2, best: 'b', rest: false },
]]
]],
])
})
})
describe('ofK', () => {
it('should create map of keys, with values provided by function', () => {
const result = map.ofK(x => x + '')([1,2,3])
assert.equal(result.constructor, Map)
assert.equal(result.size, 3)
assert.equal(result.get(1), '1')
assert.equal(result.get(2), '2')
assert.equal(result.get(3), '3')
})
})
describe('ofKV', () => {
it('should create map of keys, with keys and values by function', () => {
const result = map.ofKV((x: number) => x+'')((x: number) => x + 1)([1,2,3])
assert.equal(result.constructor, Map)
assert.equal(result.size, 3)
assert.equal(result.get('1'), 2)
assert.equal(result.get('2'), 3)
assert.equal(result.get('3'), 4)
})
})
describe('invert', () => {
it('should turn keys into values and values into keys', () => {
const m = new Map([
[1, '1'],
[2, '2'],
[3, '3']
])
const result = map.invert(m)
assert.equal(result.constructor, Map)
assert.equal(result.size, 3)
assert.equal(result.get('1'), 1)
assert.equal(result.get('2'), 2)
assert.equal(result.get('3'), 3)
})
})
describe('values', () => {
it('should return a map\'s values', () => {
const m = new Map([
[1, '1'],
[2, '2'],
[3, '3']
])
assert.deepEqual(
Array.from(map.values(m)),
['1', '2', '3']
)
})
})
describe('keys', () => {
it('should return a map\'s keys', () => {
const m = new Map([
[1, '1'],
[2, '2'],
[3, '3']
])
assert.deepEqual(
Array.from(map.keys(m)),
[1, 2, 3]
)
})
})
describe('get', () => {
it('should get a key from a map', () => {
const m = new Map([
[1, '1'],
[2, '2'],
[3, '3']
])
assert.equal(map.get(1)(m), '1')
})
it('should return undefined if key is not found', () => {
const m = new Map([
[1, '1'],
[2, '2'],
[3, '3']
])
assert.equal(map.get(4)(m), undefined)
})
})
describe('update', () => {
it('should update a map in place', () => {
const m = new Map([
[1, '1'],
[2, '2'],
[3, '3']
])
const result = map.update(parseFloat)(m)
assert.equal(result, m)
assert.deepEqual(
Array.from(result),
[
[1, 1],
[2, 2],
[3, 3],
]
)
})
})
describe('empty', () => {
it('should empty a map', () => {
const xs = new Map([
[1, '1'],
[2, '2'],
])
assert.equal(xs.size, 2)
map.empty(xs)
assert.equal(xs.size, 0)
})
})
})