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/**
* Tests if a value is a `function`.
*
* @example
* ```ts
* import * as assert from "node:assert"
* import { isFunction } from "effect/Predicate"
*
* assert.deepStrictEqual(isFunction(isFunction), true)
* assert.deepStrictEqual(isFunction("function"), false)
* ```
*
* @category guards
* @since 2.0.0
*/
export const isFunction = input => typeof input === "function";
/**
* Creates a function that can be used in a data-last (aka `pipe`able) or
* data-first style.
*
* The first parameter to `dual` is either the arity of the uncurried function
* or a predicate that determines if the function is being used in a data-first
* or data-last style.
*
* Using the arity is the most common use case, but there are some cases where
* you may want to use a predicate. For example, if you have a function that
* takes an optional argument, you can use a predicate to determine if the
* function is being used in a data-first or data-last style.
*
* You can pass either the arity of the uncurried function or a predicate
* which determines if the function is being used in a data-first or
* data-last style.
*
* **Example** (Using arity to determine data-first or data-last style)
*
* ```ts
* import { dual, pipe } from "effect/Function"
*
* const sum = 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** (Using call signatures to define the overloads)
*
* ```ts
* import { dual, pipe } from "effect/Function"
*
* const sum: {
* (that: number): (self: number) => number
* (self: number, that: number): number
* } = dual(2, (self: number, that: number): number => self + that)
*
* console.log(sum(2, 3)) // 5
* console.log(pipe(2, sum(3))) // 5
* ```
*
* **Example** (Using a predicate to determine data-first or data-last style)
*
* ```ts
* import { dual, pipe } from "effect/Function"
*
* const sum = 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
* ```
*
* @since 2.0.0
*/
export const dual = function (arity, body) {
if (typeof arity === "function") {
return function () {
if (arity(arguments)) {
// @ts-expect-error
return body.apply(this, arguments);
}
return self => body(self, ...arguments);
};
}
switch (arity) {
case 0:
case 1:
throw new RangeError(`Invalid arity ${arity}`);
case 2:
return function (a, b) {
if (arguments.length >= 2) {
return body(a, b);
}
return function (self) {
return body(self, a);
};
};
case 3:
return function (a, b, c) {
if (arguments.length >= 3) {
return body(a, b, c);
}
return function (self) {
return body(self, a, b);
};
};
case 4:
return function (a, b, c, d) {
if (arguments.length >= 4) {
return body(a, b, c, d);
}
return function (self) {
return body(self, a, b, c);
};
};
case 5:
return function (a, b, c, d, e) {
if (arguments.length >= 5) {
return body(a, b, c, d, e);
}
return function (self) {
return body(self, a, b, c, d);
};
};
default:
return function () {
if (arguments.length >= arity) {
// @ts-expect-error
return body.apply(this, arguments);
}
const args = arguments;
return function (self) {
return body(self, ...args);
};
};
}
};
/**
* Apply a function to given values.
*
* @example
* ```ts
* import * as assert from "node:assert"
* import { pipe, apply } from "effect/Function"
* import { length } from "effect/String"
*
* assert.deepStrictEqual(pipe(length, apply("hello")), 5)
* ```
*
* @since 2.0.0
*/
export const apply = (...a) => self => self(...a);
/**
* The identity function, i.e. A function that returns its input argument.
*
* @example
* ```ts
* import * as assert from "node:assert"
* import { identity } from "effect/Function"
*
* assert.deepStrictEqual(identity(5), 5)
* ```
*
* @since 2.0.0
*/
export const identity = a => a;
/**
* A function that ensures that the type of an expression matches some type,
* without changing the resulting type of that expression.
*
* @example
* ```ts
* import * as assert from "node:assert"
* import { satisfies } from "effect/Function"
*
* const test1 = satisfies<number>()(5 as const)
* //^? const test: 5
* // @ts-expect-error
* const test2 = satisfies<string>()(5)
* //^? Argument of type 'number' is not assignable to parameter of type 'string'
*
* assert.deepStrictEqual(satisfies<number>()(5), 5)
* ```
*
* @since 2.0.0
*/
export const satisfies = () => b => b;
/**
* Casts the result to the specified type.
*
* @example
* ```ts
* import * as assert from "node:assert"
* import { unsafeCoerce, identity } from "effect/Function"
*
* assert.deepStrictEqual(unsafeCoerce, identity)
* ```
*
* @since 2.0.0
*/
export const unsafeCoerce = identity;
/**
* Creates a constant value that never changes.
*
* This is useful when you want to pass a value to a higher-order function (a function that takes another function as its argument)
* and want that inner function to always use the same value, no matter how many times it is called.
*
* @example
* ```ts
* import * as assert from "node:assert"
* import { constant } from "effect/Function"
*
* const constNull = constant(null)
*
* assert.deepStrictEqual(constNull(), null)
* assert.deepStrictEqual(constNull(), null)
* ```
*
* @since 2.0.0
*/
export const constant = value => () => value;
/**
* A thunk that returns always `true`.
*
* @example
* ```ts
* import * as assert from "node:assert"
* import { constTrue } from "effect/Function"
*
* assert.deepStrictEqual(constTrue(), true)
* ```
*
* @since 2.0.0
*/
export const constTrue = /*#__PURE__*/constant(true);
/**
* A thunk that returns always `false`.
*
* @example
* ```ts
* import * as assert from "node:assert"
* import { constFalse } from "effect/Function"
*
* assert.deepStrictEqual(constFalse(), false)
* ```
*
* @since 2.0.0
*/
export const constFalse = /*#__PURE__*/constant(false);
/**
* A thunk that returns always `null`.
*
* @example
* ```ts
* import * as assert from "node:assert"
* import { constNull } from "effect/Function"
*
* assert.deepStrictEqual(constNull(), null)
* ```
*
* @since 2.0.0
*/
export const constNull = /*#__PURE__*/constant(null);
/**
* A thunk that returns always `undefined`.
*
* @example
* ```ts
* import * as assert from "node:assert"
* import { constUndefined } from "effect/Function"
*
* assert.deepStrictEqual(constUndefined(), undefined)
* ```
*
* @since 2.0.0
*/
export const constUndefined = /*#__PURE__*/constant(undefined);
/**
* A thunk that returns always `void`.
*
* @example
* ```ts
* import * as assert from "node:assert"
* import { constVoid } from "effect/Function"
*
* assert.deepStrictEqual(constVoid(), undefined)
* ```
*
* @since 2.0.0
*/
export const constVoid = constUndefined;
/**
* Reverses the order of arguments for a curried function.
*
* @example
* ```ts
* import * as assert from "node:assert"
* import { flip } from "effect/Function"
*
* const f = (a: number) => (b: string) => a - b.length
*
* assert.deepStrictEqual(flip(f)('aaa')(2), -1)
* ```
*
* @since 2.0.0
*/
export const flip = f => (...b) => (...a) => f(...a)(...b);
/**
* Composes two functions, `ab` and `bc` into a single function that takes in an argument `a` of type `A` and returns a result of type `C`.
* The result is obtained by first applying the `ab` function to `a` and then applying the `bc` function to the result of `ab`.
*
* @example
* ```ts
* import * as assert from "node:assert"
* import { compose } from "effect/Function"
*
* const increment = (n: number) => n + 1;
* const square = (n: number) => n * n;
*
* assert.strictEqual(compose(increment, square)(2), 9);
* ```
*
* @since 2.0.0
*/
export const compose = /*#__PURE__*/dual(2, (ab, bc) => a => bc(ab(a)));
/**
* The `absurd` function is a stub for cases where a value of type `never` is encountered in your code,
* meaning that it should be impossible for this code to be executed.
*
* This function is particularly useful when it's necessary to specify that certain cases are impossible.
*
* @since 2.0.0
*/
export const absurd = _ => {
throw new Error("Called `absurd` function which should be uncallable");
};
/**
* Creates a version of this function: instead of `n` arguments, it accepts a single tuple argument.
*
* @example
* ```ts
* import * as assert from "node:assert"
* import { tupled } from "effect/Function"
*
* const sumTupled = tupled((x: number, y: number): number => x + y)
*
* assert.deepStrictEqual(sumTupled([1, 2]), 3)
* ```
*
* @since 2.0.0
*/
export const tupled = f => a => f(...a);
/**
* Inverse function of `tupled`
*
* @example
* ```ts
* import * as assert from "node:assert"
* import { untupled } from "effect/Function"
*
* const getFirst = untupled(<A, B>(tuple: [A, B]): A => tuple[0])
*
* assert.deepStrictEqual(getFirst(1, 2), 1)
* ```
*
* @since 2.0.0
*/
export const untupled = f => (...a) => f(a);
export function pipe(a, ab, bc, cd, de, ef, fg, gh, hi) {
switch (arguments.length) {
case 1:
return a;
case 2:
return ab(a);
case 3:
return bc(ab(a));
case 4:
return cd(bc(ab(a)));
case 5:
return de(cd(bc(ab(a))));
case 6:
return ef(de(cd(bc(ab(a)))));
case 7:
return fg(ef(de(cd(bc(ab(a))))));
case 8:
return gh(fg(ef(de(cd(bc(ab(a)))))));
case 9:
return hi(gh(fg(ef(de(cd(bc(ab(a))))))));
default:
{
let ret = arguments[0];
for (let i = 1; i < arguments.length; i++) {
ret = arguments[i](ret);
}
return ret;
}
}
}
export function flow(ab, bc, cd, de, ef, fg, gh, hi, ij) {
switch (arguments.length) {
case 1:
return ab;
case 2:
return function () {
return bc(ab.apply(this, arguments));
};
case 3:
return function () {
return cd(bc(ab.apply(this, arguments)));
};
case 4:
return function () {
return de(cd(bc(ab.apply(this, arguments))));
};
case 5:
return function () {
return ef(de(cd(bc(ab.apply(this, arguments)))));
};
case 6:
return function () {
return fg(ef(de(cd(bc(ab.apply(this, arguments))))));
};
case 7:
return function () {
return gh(fg(ef(de(cd(bc(ab.apply(this, arguments)))))));
};
case 8:
return function () {
return hi(gh(fg(ef(de(cd(bc(ab.apply(this, arguments))))))));
};
case 9:
return function () {
return ij(hi(gh(fg(ef(de(cd(bc(ab.apply(this, arguments)))))))));
};
}
return;
}
/**
* Type hole simulation.
*
* @since 2.0.0
*/
export const hole = /*#__PURE__*/unsafeCoerce(absurd);
/**
* The SK combinator, also known as the "S-K combinator" or "S-combinator", is a fundamental combinator in the
* lambda calculus and the SKI combinator calculus.
*
* This function is useful for discarding the first argument passed to it and returning the second argument.
*
* @example
* ```ts
* import * as assert from "node:assert"
* import { SK } from "effect/Function";
*
* assert.deepStrictEqual(SK(0, "hello"), "hello")
* ```
*
* @since 2.0.0
*/
export const SK = (_, b) => b;
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