<InputR, PassR, FailR>(right: Filter<InputR, PassR, FailR>): <
InputL,
PassL,
FailL
>(
left: Filter<InputL, PassL, FailL>
) => Filter<InputL & InputR, PassL, FailL | FailR>
<InputL, PassL, FailL, InputR, PassR, FailR>(
left: Filter<InputL, PassL, FailL>,
right: Filter<InputR, PassR, FailR>
): Filter<InputL & InputR, PassL, FailL | FailR>Combines two filters but only returns the result of the left filter.
Example (Keeping the left filter result)
import { Filter } from "effect"
const positiveNumbers = Filter.fromPredicate((n: number) => n > 0)
const evenNumbers = Filter.fromPredicate((n: number) => n % 2 === 0)
const positiveEven = Filter.andLeft(positiveNumbers, evenNumbers)combinators
Source effect/Filter.ts:66514 lines
export const const andLeft: {
<InputR, PassR, FailR>(
right: Filter<InputR, PassR, FailR>
): <InputL, PassL, FailL>(
left: Filter<InputL, PassL, FailL>
) => Filter<
InputL & InputR,
PassL,
FailL | FailR
>
<InputL, PassL, FailL, InputR, PassR, FailR>(
left: Filter<InputL, PassL, FailL>,
right: Filter<InputR, PassR, FailR>
): Filter<InputL & InputR, PassL, FailL | FailR>
}
Combines two filters but only returns the result of the left filter.
Example (Keeping the left filter result)
import { Filter } from "effect"
const positiveNumbers = Filter.fromPredicate((n: number) => n > 0)
const evenNumbers = Filter.fromPredicate((n: number) => n % 2 === 0)
const positiveEven = Filter.andLeft(positiveNumbers, evenNumbers)
andLeft: {
<function (type parameter) InputR in <InputR, PassR, FailR>(right: Filter<InputR, PassR, FailR>): <InputL, PassL, FailL>(left: Filter<InputL, PassL, FailL>) => Filter<InputL & InputR, PassL, FailL | FailR>InputR, function (type parameter) PassR in <InputR, PassR, FailR>(right: Filter<InputR, PassR, FailR>): <InputL, PassL, FailL>(left: Filter<InputL, PassL, FailL>) => Filter<InputL & InputR, PassL, FailL | FailR>PassR, function (type parameter) FailR in <InputR, PassR, FailR>(right: Filter<InputR, PassR, FailR>): <InputL, PassL, FailL>(left: Filter<InputL, PassL, FailL>) => Filter<InputL & InputR, PassL, FailL | FailR>FailR>(
right: Filter<InputR, PassR, FailR>right: interface Filter<in Input, out Pass = Input, out Fail = Input>Represents a filter function that can transform inputs to outputs or filter them out.
Details
A filter takes an input value and either returns a boxed pass value or the
special fail type to indicate the value should be filtered out.
Example (Defining a positive number filter)
import { Filter, Result } from "effect"
// A filter that only passes positive numbers
const positiveFilter: Filter.Filter<number> = (n) => n > 0 ? Result.succeed(n) : Result.fail(n)
console.log(positiveFilter(5)) // Result.succeed(5)
console.log(positiveFilter(-3)) // Result.fail(-3)
Filter<function (type parameter) InputR in <InputR, PassR, FailR>(right: Filter<InputR, PassR, FailR>): <InputL, PassL, FailL>(left: Filter<InputL, PassL, FailL>) => Filter<InputL & InputR, PassL, FailL | FailR>InputR, function (type parameter) PassR in <InputR, PassR, FailR>(right: Filter<InputR, PassR, FailR>): <InputL, PassL, FailL>(left: Filter<InputL, PassL, FailL>) => Filter<InputL & InputR, PassL, FailL | FailR>PassR, function (type parameter) FailR in <InputR, PassR, FailR>(right: Filter<InputR, PassR, FailR>): <InputL, PassL, FailL>(left: Filter<InputL, PassL, FailL>) => Filter<InputL & InputR, PassL, FailL | FailR>FailR>
): <function (type parameter) InputL in <InputL, PassL, FailL>(left: Filter<InputL, PassL, FailL>): Filter<InputL & InputR, PassL, FailL | FailR>InputL, function (type parameter) PassL in <InputL, PassL, FailL>(left: Filter<InputL, PassL, FailL>): Filter<InputL & InputR, PassL, FailL | FailR>PassL, function (type parameter) FailL in <InputL, PassL, FailL>(left: Filter<InputL, PassL, FailL>): Filter<InputL & InputR, PassL, FailL | FailR>FailL>(
left: Filter<InputL, PassL, FailL>left: interface Filter<in Input, out Pass = Input, out Fail = Input>Represents a filter function that can transform inputs to outputs or filter them out.
Details
A filter takes an input value and either returns a boxed pass value or the
special fail type to indicate the value should be filtered out.
Example (Defining a positive number filter)
import { Filter, Result } from "effect"
// A filter that only passes positive numbers
const positiveFilter: Filter.Filter<number> = (n) => n > 0 ? Result.succeed(n) : Result.fail(n)
console.log(positiveFilter(5)) // Result.succeed(5)
console.log(positiveFilter(-3)) // Result.fail(-3)
Filter<function (type parameter) InputL in <InputL, PassL, FailL>(left: Filter<InputL, PassL, FailL>): Filter<InputL & InputR, PassL, FailL | FailR>InputL, function (type parameter) PassL in <InputL, PassL, FailL>(left: Filter<InputL, PassL, FailL>): Filter<InputL & InputR, PassL, FailL | FailR>PassL, function (type parameter) FailL in <InputL, PassL, FailL>(left: Filter<InputL, PassL, FailL>): Filter<InputL & InputR, PassL, FailL | FailR>FailL>
) => interface Filter<in Input, out Pass = Input, out Fail = Input>Represents a filter function that can transform inputs to outputs or filter them out.
Details
A filter takes an input value and either returns a boxed pass value or the
special fail type to indicate the value should be filtered out.
Example (Defining a positive number filter)
import { Filter, Result } from "effect"
// A filter that only passes positive numbers
const positiveFilter: Filter.Filter<number> = (n) => n > 0 ? Result.succeed(n) : Result.fail(n)
console.log(positiveFilter(5)) // Result.succeed(5)
console.log(positiveFilter(-3)) // Result.fail(-3)
Filter<function (type parameter) InputL in <InputL, PassL, FailL>(left: Filter<InputL, PassL, FailL>): Filter<InputL & InputR, PassL, FailL | FailR>InputL & function (type parameter) InputR in <InputR, PassR, FailR>(right: Filter<InputR, PassR, FailR>): <InputL, PassL, FailL>(left: Filter<InputL, PassL, FailL>) => Filter<InputL & InputR, PassL, FailL | FailR>InputR, function (type parameter) PassL in <InputL, PassL, FailL>(left: Filter<InputL, PassL, FailL>): Filter<InputL & InputR, PassL, FailL | FailR>PassL, function (type parameter) FailL in <InputL, PassL, FailL>(left: Filter<InputL, PassL, FailL>): Filter<InputL & InputR, PassL, FailL | FailR>FailL | function (type parameter) FailR in <InputR, PassR, FailR>(right: Filter<InputR, PassR, FailR>): <InputL, PassL, FailL>(left: Filter<InputL, PassL, FailL>) => Filter<InputL & InputR, PassL, FailL | FailR>FailR>
<function (type parameter) InputL in <InputL, PassL, FailL, InputR, PassR, FailR>(left: Filter<InputL, PassL, FailL>, right: Filter<InputR, PassR, FailR>): Filter<InputL & InputR, PassL, FailL | FailR>InputL, function (type parameter) PassL in <InputL, PassL, FailL, InputR, PassR, FailR>(left: Filter<InputL, PassL, FailL>, right: Filter<InputR, PassR, FailR>): Filter<InputL & InputR, PassL, FailL | FailR>PassL, function (type parameter) FailL in <InputL, PassL, FailL, InputR, PassR, FailR>(left: Filter<InputL, PassL, FailL>, right: Filter<InputR, PassR, FailR>): Filter<InputL & InputR, PassL, FailL | FailR>FailL, function (type parameter) InputR in <InputL, PassL, FailL, InputR, PassR, FailR>(left: Filter<InputL, PassL, FailL>, right: Filter<InputR, PassR, FailR>): Filter<InputL & InputR, PassL, FailL | FailR>InputR, function (type parameter) PassR in <InputL, PassL, FailL, InputR, PassR, FailR>(left: Filter<InputL, PassL, FailL>, right: Filter<InputR, PassR, FailR>): Filter<InputL & InputR, PassL, FailL | FailR>PassR, function (type parameter) FailR in <InputL, PassL, FailL, InputR, PassR, FailR>(left: Filter<InputL, PassL, FailL>, right: Filter<InputR, PassR, FailR>): Filter<InputL & InputR, PassL, FailL | FailR>FailR>(
left: Filter<InputL, PassL, FailL>left: interface Filter<in Input, out Pass = Input, out Fail = Input>Represents a filter function that can transform inputs to outputs or filter them out.
Details
A filter takes an input value and either returns a boxed pass value or the
special fail type to indicate the value should be filtered out.
Example (Defining a positive number filter)
import { Filter, Result } from "effect"
// A filter that only passes positive numbers
const positiveFilter: Filter.Filter<number> = (n) => n > 0 ? Result.succeed(n) : Result.fail(n)
console.log(positiveFilter(5)) // Result.succeed(5)
console.log(positiveFilter(-3)) // Result.fail(-3)
Filter<function (type parameter) InputL in <InputL, PassL, FailL, InputR, PassR, FailR>(left: Filter<InputL, PassL, FailL>, right: Filter<InputR, PassR, FailR>): Filter<InputL & InputR, PassL, FailL | FailR>InputL, function (type parameter) PassL in <InputL, PassL, FailL, InputR, PassR, FailR>(left: Filter<InputL, PassL, FailL>, right: Filter<InputR, PassR, FailR>): Filter<InputL & InputR, PassL, FailL | FailR>PassL, function (type parameter) FailL in <InputL, PassL, FailL, InputR, PassR, FailR>(left: Filter<InputL, PassL, FailL>, right: Filter<InputR, PassR, FailR>): Filter<InputL & InputR, PassL, FailL | FailR>FailL>,
right: Filter<InputR, PassR, FailR>right: interface Filter<in Input, out Pass = Input, out Fail = Input>Represents a filter function that can transform inputs to outputs or filter them out.
Details
A filter takes an input value and either returns a boxed pass value or the
special fail type to indicate the value should be filtered out.
Example (Defining a positive number filter)
import { Filter, Result } from "effect"
// A filter that only passes positive numbers
const positiveFilter: Filter.Filter<number> = (n) => n > 0 ? Result.succeed(n) : Result.fail(n)
console.log(positiveFilter(5)) // Result.succeed(5)
console.log(positiveFilter(-3)) // Result.fail(-3)
Filter<function (type parameter) InputR in <InputL, PassL, FailL, InputR, PassR, FailR>(left: Filter<InputL, PassL, FailL>, right: Filter<InputR, PassR, FailR>): Filter<InputL & InputR, PassL, FailL | FailR>InputR, function (type parameter) PassR in <InputL, PassL, FailL, InputR, PassR, FailR>(left: Filter<InputL, PassL, FailL>, right: Filter<InputR, PassR, FailR>): Filter<InputL & InputR, PassL, FailL | FailR>PassR, function (type parameter) FailR in <InputL, PassL, FailL, InputR, PassR, FailR>(left: Filter<InputL, PassL, FailL>, right: Filter<InputR, PassR, FailR>): Filter<InputL & InputR, PassL, FailL | FailR>FailR>
): interface Filter<in Input, out Pass = Input, out Fail = Input>Represents a filter function that can transform inputs to outputs or filter them out.
Details
A filter takes an input value and either returns a boxed pass value or the
special fail type to indicate the value should be filtered out.
Example (Defining a positive number filter)
import { Filter, Result } from "effect"
// A filter that only passes positive numbers
const positiveFilter: Filter.Filter<number> = (n) => n > 0 ? Result.succeed(n) : Result.fail(n)
console.log(positiveFilter(5)) // Result.succeed(5)
console.log(positiveFilter(-3)) // Result.fail(-3)
Filter<function (type parameter) InputL in <InputL, PassL, FailL, InputR, PassR, FailR>(left: Filter<InputL, PassL, FailL>, right: Filter<InputR, PassR, FailR>): Filter<InputL & InputR, PassL, FailL | FailR>InputL & function (type parameter) InputR in <InputL, PassL, FailL, InputR, PassR, FailR>(left: Filter<InputL, PassL, FailL>, right: Filter<InputR, PassR, FailR>): Filter<InputL & InputR, PassL, FailL | FailR>InputR, function (type parameter) PassL in <InputL, PassL, FailL, InputR, PassR, FailR>(left: Filter<InputL, PassL, FailL>, right: Filter<InputR, PassR, FailR>): Filter<InputL & InputR, PassL, FailL | FailR>PassL, function (type parameter) FailL in <InputL, PassL, FailL, InputR, PassR, FailR>(left: Filter<InputL, PassL, FailL>, right: Filter<InputR, PassR, FailR>): Filter<InputL & InputR, PassL, FailL | FailR>FailL | function (type parameter) FailR in <InputL, PassL, FailL, InputR, PassR, FailR>(left: Filter<InputL, PassL, FailL>, right: Filter<InputR, PassR, FailR>): Filter<InputL & InputR, PassL, FailL | FailR>FailR>
} = dual<(...args: Array<any>) => any, <InputL, PassL, FailL, InputR, PassR, FailR>(left: Filter<InputL, PassL, FailL>, right: Filter<InputR, PassR, FailR>) => Filter<InputL & InputR, PassL, FailL | FailR>>(arity: 2, body: <InputL, PassL, FailL, InputR, PassR, FailR>(left: Filter<InputL, PassL, FailL>, right: Filter<InputR, PassR, FailR>) => Filter<InputL & InputR, PassL, FailL | FailR>): ((...args: Array<any>) => any) & (<InputL, PassL, FailL, InputR, PassR, FailR>(left: Filter<InputL, PassL, FailL>, right: Filter<InputR, PassR, FailR>) => Filter<InputL & InputR, PassL, FailL | FailR>) (+1 overload)Creates a function that can be called in data-first style or data-last
(pipe-friendly) style.
When to use
Use to expose one implementation through both direct and pipe-friendly
call styles.
Details
Pass either the arity of the uncurried function or a predicate that decides
whether the current call is data-first. Arity is the common case. Use a
predicate when optional arguments make arity ambiguous.
Example (Selecting data-first or data-last style by arity)
import { Function, pipe } from "effect"
const sum = Function.dual<
(that: number) => (self: number) => number,
(self: number, that: number) => number
>(2, (self, that) => self + that)
console.log(sum(2, 3)) // 5
console.log(pipe(2, sum(3))) // 5
Example (Defining overloads with call signatures)
import { Function, pipe } from "effect"
const sum: {
(that: number): (self: number) => number
(self: number, that: number): number
} = Function.dual(2, (self: number, that: number): number => self + that)
console.log(sum(2, 3)) // 5
console.log(pipe(2, sum(3))) // 5
Example (Selecting data-first or data-last style with a predicate)
import { Function, pipe } from "effect"
const sum = Function.dual<
(that: number) => (self: number) => number,
(self: number, that: number) => number
>(
(args) => args.length === 2,
(self, that) => self + that
)
console.log(sum(2, 3)) // 5
console.log(pipe(2, sum(3))) // 5
dual(2, <function (type parameter) InputL in <InputL, PassL, FailL, InputR, PassR, FailR>(left: Filter<InputL, PassL, FailL>, right: Filter<InputR, PassR, FailR>): Filter<InputL & InputR, PassL, FailL | FailR>InputL, function (type parameter) PassL in <InputL, PassL, FailL, InputR, PassR, FailR>(left: Filter<InputL, PassL, FailL>, right: Filter<InputR, PassR, FailR>): Filter<InputL & InputR, PassL, FailL | FailR>PassL, function (type parameter) FailL in <InputL, PassL, FailL, InputR, PassR, FailR>(left: Filter<InputL, PassL, FailL>, right: Filter<InputR, PassR, FailR>): Filter<InputL & InputR, PassL, FailL | FailR>FailL, function (type parameter) InputR in <InputL, PassL, FailL, InputR, PassR, FailR>(left: Filter<InputL, PassL, FailL>, right: Filter<InputR, PassR, FailR>): Filter<InputL & InputR, PassL, FailL | FailR>InputR, function (type parameter) PassR in <InputL, PassL, FailL, InputR, PassR, FailR>(left: Filter<InputL, PassL, FailL>, right: Filter<InputR, PassR, FailR>): Filter<InputL & InputR, PassL, FailL | FailR>PassR, function (type parameter) FailR in <InputL, PassL, FailL, InputR, PassR, FailR>(left: Filter<InputL, PassL, FailL>, right: Filter<InputR, PassR, FailR>): Filter<InputL & InputR, PassL, FailL | FailR>FailR>(
left: Filter<InputL, PassL, FailL>left: interface Filter<in Input, out Pass = Input, out Fail = Input>Represents a filter function that can transform inputs to outputs or filter them out.
Details
A filter takes an input value and either returns a boxed pass value or the
special fail type to indicate the value should be filtered out.
Example (Defining a positive number filter)
import { Filter, Result } from "effect"
// A filter that only passes positive numbers
const positiveFilter: Filter.Filter<number> = (n) => n > 0 ? Result.succeed(n) : Result.fail(n)
console.log(positiveFilter(5)) // Result.succeed(5)
console.log(positiveFilter(-3)) // Result.fail(-3)
Filter<function (type parameter) InputL in <InputL, PassL, FailL, InputR, PassR, FailR>(left: Filter<InputL, PassL, FailL>, right: Filter<InputR, PassR, FailR>): Filter<InputL & InputR, PassL, FailL | FailR>InputL, function (type parameter) PassL in <InputL, PassL, FailL, InputR, PassR, FailR>(left: Filter<InputL, PassL, FailL>, right: Filter<InputR, PassR, FailR>): Filter<InputL & InputR, PassL, FailL | FailR>PassL, function (type parameter) FailL in <InputL, PassL, FailL, InputR, PassR, FailR>(left: Filter<InputL, PassL, FailL>, right: Filter<InputR, PassR, FailR>): Filter<InputL & InputR, PassL, FailL | FailR>FailL>,
right: Filter<InputR, PassR, FailR>right: interface Filter<in Input, out Pass = Input, out Fail = Input>Represents a filter function that can transform inputs to outputs or filter them out.
Details
A filter takes an input value and either returns a boxed pass value or the
special fail type to indicate the value should be filtered out.
Example (Defining a positive number filter)
import { Filter, Result } from "effect"
// A filter that only passes positive numbers
const positiveFilter: Filter.Filter<number> = (n) => n > 0 ? Result.succeed(n) : Result.fail(n)
console.log(positiveFilter(5)) // Result.succeed(5)
console.log(positiveFilter(-3)) // Result.fail(-3)
Filter<function (type parameter) InputR in <InputL, PassL, FailL, InputR, PassR, FailR>(left: Filter<InputL, PassL, FailL>, right: Filter<InputR, PassR, FailR>): Filter<InputL & InputR, PassL, FailL | FailR>InputR, function (type parameter) PassR in <InputL, PassL, FailL, InputR, PassR, FailR>(left: Filter<InputL, PassL, FailL>, right: Filter<InputR, PassR, FailR>): Filter<InputL & InputR, PassL, FailL | FailR>PassR, function (type parameter) FailR in <InputL, PassL, FailL, InputR, PassR, FailR>(left: Filter<InputL, PassL, FailL>, right: Filter<InputR, PassR, FailR>): Filter<InputL & InputR, PassL, FailL | FailR>FailR>
): interface Filter<in Input, out Pass = Input, out Fail = Input>Represents a filter function that can transform inputs to outputs or filter them out.
Details
A filter takes an input value and either returns a boxed pass value or the
special fail type to indicate the value should be filtered out.
Example (Defining a positive number filter)
import { Filter, Result } from "effect"
// A filter that only passes positive numbers
const positiveFilter: Filter.Filter<number> = (n) => n > 0 ? Result.succeed(n) : Result.fail(n)
console.log(positiveFilter(5)) // Result.succeed(5)
console.log(positiveFilter(-3)) // Result.fail(-3)
Filter<function (type parameter) InputL in <InputL, PassL, FailL, InputR, PassR, FailR>(left: Filter<InputL, PassL, FailL>, right: Filter<InputR, PassR, FailR>): Filter<InputL & InputR, PassL, FailL | FailR>InputL & function (type parameter) InputR in <InputL, PassL, FailL, InputR, PassR, FailR>(left: Filter<InputL, PassL, FailL>, right: Filter<InputR, PassR, FailR>): Filter<InputL & InputR, PassL, FailL | FailR>InputR, function (type parameter) PassL in <InputL, PassL, FailL, InputR, PassR, FailR>(left: Filter<InputL, PassL, FailL>, right: Filter<InputR, PassR, FailR>): Filter<InputL & InputR, PassL, FailL | FailR>PassL, function (type parameter) FailL in <InputL, PassL, FailL, InputR, PassR, FailR>(left: Filter<InputL, PassL, FailL>, right: Filter<InputR, PassR, FailR>): Filter<InputL & InputR, PassL, FailL | FailR>FailL | function (type parameter) FailR in <InputL, PassL, FailL, InputR, PassR, FailR>(left: Filter<InputL, PassL, FailL>, right: Filter<InputR, PassR, FailR>): Filter<InputL & InputR, PassL, FailL | FailR>FailR> => const zipWith: {
<PassL, InputR, PassR, FailR, A>(
right: Filter<InputR, PassR, FailR>,
f: (left: PassL, right: PassR) => A
): <InputL, FailL>(
left: Filter<InputL, PassL, FailL>
) => Filter<InputL & InputR, A, FailL | FailR>
<InputL, PassL, FailL, InputR, PassR, FailR, A>(
left: Filter<InputL, PassL, FailL>,
right: Filter<InputR, PassR, FailR>,
f: (left: PassL, right: PassR) => A
): Filter<InputL & InputR, A, FailL | FailR>
}
left: Filter<InputL, PassL, FailL>left, right: Filter<InputR, PassR, FailR>right, (leftResult: PassLleftResult) => leftResult: PassLleftResult))