@prelude/generator
v9.0.0
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Generator module.
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Generator module
areUnique: <T, U>(g: Iterable<T>, f?: (value: T) => U) => boolean
Returns
true
if iterable has unique elements,false
otherwise.Optionally mapping function from element to same-value equality key can be provided.
array: <T>(g: Iterable<T>) => T[]
Returns an array from iterable.
bigproduct: (g: Iterable<bigint>) => bigint
Returns product of iterable elements.
bigsum: (g: Iterable<bigint>) => bigint
Returns sum of iterable elements.
cartesianProduct: <T, U extends Iterable<unknown>>(g?: U) => (h: Iterable<T>) => Generator<[T, U extends undefined ? T : Iterated<U>], any, unknown>
Yields cartesian product pairs.
charRange: (first: string, last: string) => Generator<string, any, unknown>
Yields characters from
first
tolast
inclusive.combinations: <T>(k?: number) => (g: Iterable<T>) => Generator<T[], any, unknown>
Yields k-element combinations.
compact: <T>(g: Iterable<T>) => Generator<NonNullable<T>, any, unknown>
Yields non-nullish elements.
See defined for filtering out
undefined
elements only.composites: () => Generator<number, void, unknown>
Yields non-prime integers.
concat: <Gs extends Iterable<unknown>[]>(...gs: Gs) => Generator<Iterated<Gs[number]>, any, unknown>
Yields values from provided iterables.
consume: <T>(f?: (value: T) => unknown) => (g: Iterable<T>) => void
Performs side effect function on each of iterable value.
count: <T>(f?: (value: T, index: number) => boolean) => (g: Iterable<T>) => number
Returns number of elements that passed predicate test.
cycle: <T>(g: Iterable<T>) => Generator<T, any, unknown>
Returns infinite generator cycling through iterable values.
Empty generator if provided iterable has no elements.
defined: <T>(g: Iterable<T>) => Generator<Defined<T>, any, unknown>
Yields defined values,
undefined
values are filtered out.See compact
every: <T>(f: (value: T, index: number) => boolean) => (g: Iterable<T>) => boolean
Returns
true
if all elements are passing provided predicate,false
otherwise.fibonacci: (a?: number, b?: number) => Generator<number, never, unknown>
Yields fibonacci sequence.
filter: <T>(f: (value: T, index: number) => boolean) => (g: Iterable<T>) => Generator<T, any, unknown>
Yields elements passing provided predicate only.
find: <T>(f: (value: T, index: number) => boolean) => (g: Iterable<T>) => T
Returns first found value that passes provided predicate.
Throws {Error} if not found.
See maybeFind for non-throwing variant.
first: <T>(g: Iterable<T>) => T
Returns first element.
Throws {Error} if iterable is empty.
See maybeFirst for non-throwing variant.
flatMap: <T, R>(f: (value: T, index: number) => Iterable<R>) => (g: Iterable<T>) => Generator<R, any, unknown>
flatMap-like combinator.
flatten: <T>(gs: Iterable<Iterable<T>>) => Generator<T, any, unknown>
Yields flattened values from provided iterable iterables.
from: (first: number, step?: number) => Generator<number, any, unknown>
Returns infinite generator of numbers starting from
first
with providedstep
(default to 1).group: <T, K extends string | number | boolean | symbol>(f: (value: T) => K) => (g: Iterable<T>) => Generator<[key: K, values: T[]], void, undefined>
grouped: <T, K extends string>(f: (value: T) => K) => (g: Iterable<T>) => Record<K, T[]>
interleave: <Gs extends Generator<unknown, any, unknown>[]>(...gs: Gs) => Generator<Generated<Gs[number]>, any, unknown>
joinStrings: (separator: string) => (g: Iterable<string>) => string
last: <T>(g: Iterable<T>) => T
length: (g: Iterable<unknown>) => number
map: <T, R>(f: (value: T, index: number) => R) => (g: Iterable<T>) => Generator<R, any, unknown>
max: (g: Iterable<number>) => number
maybeFind: <T>(f: (value: T, index: number) => boolean) => (g: Iterable<T>) => T
Returns first value passing predicate or
undefined
if not found.maybeLast: <T>(g: Iterable<T>) => T
memoized: <T>(g: Iterable<T>) => { (): Generator<T, any, unknown>; values: T[]; }
min: (g: Iterable<number>) => number
of: <T>(g: Iterator<T, any, undefined> | Iterable<T>) => Generator<T, any, unknown>
pair: <A, B>(a: Generator<A, any, unknown>, b: Generator<B, any, unknown>) => Generator<[A, B], any, unknown>
permutations: <T>(k?: number) => (g: Iterable<T>) => Generator<T[], any, unknown>
pipe: Pipe
pipe1: Pipe1
primeFactors: (value: number) => Generator<[prime: number, exponent: number], any, unknown>
Yields naïve prime factors with exponents.
primes: { (): Generator<number, any, unknown>; values: number[]; }
product: (g: Iterable<number>) => number
range: (start: number, end: number) => Generator<number, any, unknown>
Param start Start of range.
Param end End of range (inclusive).
Return
start
toend
inclusive range number iterator.reduce: <T, U>(f: (result: U, value: T, index: number) => U, initialResult: U) => (g: Iterable<T>) => U
repeat: <T>(n: number, f: () => T) => Generator<T, any, unknown>
Repeats
value
returned fromf
functionn
times.Example repeat(3, () => 'yes')
Example repeat(5, Math.random)
retain: <T = unknown, TReturn = unknown, TNext = unknown>(g: Generator<T, any, unknown>) => Generator<T, TReturn, TNext>
reverse: <T>(g: Iterable<T>) => Generator<T, any, unknown>
rotate: <T>(n: number) => (g: Iterable<T>) => Generator<T, any, unknown>
skip: <T>(n: number) => (g: Generator<T, any, unknown>) => Generator<T, any, unknown>
skipWhile: <T>(f: (value: T, index: number) => boolean) => (g: Iterable<T>) => Generator<T, any, unknown>
some: <T>(f: (value: T, index: number) => boolean) => (g: Iterable<T>) => boolean
Returns
true
if at least onef
-predicate returnstrue
,false
otherwise.sort: <T>(cmp: t<T>) => (g: Iterable<T>) => Generator<T, any, unknown>
step: <T>(n: number) => (g: Iterable<T>) => Generator<T, any, unknown>
sum: (g: Iterable<number>) => number
take: <T>(n: number) => (g: Iterable<T>) => Generator<T, any, unknown>
tap: <T, U>(f: (value: T, index: number, state: U) => U) => (g: Iterable<T>) => Generator<T, any, unknown>
unique: <T>(f: (value: T, index: number) => string | number) => (g: Generator<T, any, unknown>) => Generator<T, any, unknown>
unsafeCombinations: <T>(k?: number) => (g: Iterable<T>) => Generator<T[], any, unknown>
unsafePermutations: <T>(k?: number) => (g: Iterable<T>) => Generator<T[], any, unknown>
until: <T>(f: (value: T, index: number) => boolean) => (g: Iterable<T>) => Generator<T, any, unknown>
while: <T>(f: (value: T, index: number) => boolean) => (g: Iterable<T>) => Generator<T, any, unknown>
window: <T>(n: number) => (g: Iterable<T>) => Generator<T[], any, unknown>
withIndex: <T>(g: Iterable<T>) => Generator<[T, number], any, unknown>
Yields an index together with an element.
Param g Generator.
Returns Generator yielding an index together with an element.
yield: <T>(value: T) => Generator<T, any, unknown>
zip: <Gs extends Generator<unknown, any, unknown>[]>(...gs: Gs) => Generator<{ [K in keyof Gs]: Generated<Gs[K]>; }, any, unknown>
zipRecord: <Gs extends { [key: string]: Generator<unknown, any, unknown>; }>(gs: Gs) => Generator<{ [K in keyof Gs]: Generated<Gs[K]>; }, any, unknown>
Usage
npm i -E @prelude/generator
import * as G from '@prelude/generator'
console.log(G.pipe1(
G.charRange('a', 'c'),
G.cycle,
G.take(10),
G.array
))
// [
// 'a', 'b', 'c', 'a',
// 'b', 'c', 'a', 'b',
// 'c', 'a'
// ]
License
MIT License
Copyright 2021 Mirek Rusin
Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.