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index.ts
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interface Variadic<T> {
(...args: any[]): T;
}
export type Fn1<A, B> = (a: A, ...rest: Array<void>) => B;
export type Fn2<A, B, C> = (a: A, b: B, ...rest: Array<void>) => C;
export type Fn3<A, B, C, D> = (a: A, b: B, c: C, ...rest: Array<void>) => D;
export type Fn4<A, B, C, D, E> = (a: A, b: B, c: C, d: D, ...rest: Array<void>) => E;
export type Fn5<A, B, C, D, E, F> = (a: A, b: B, c: C, d: D, e: E, ...rest: Array<void>) => F;
export type Fn6<A, B, C, D, E, F, G> = (a: A, b: B, c: C, d: D, e: E, f: F, ...rest: Array<void>) => G;
export type Fn7<A, B, C, D, E, F, G, H> = (a: A, b: B, c: C, d: D, e: E, f: F, g: G, ...rest: Array<void>) => H;
export type Fn8<A, B, C, D, E, F, G, H, I> = (a: A, b: B, c: C, d: D, e: E, f: F, g: G, h: H, ...rest: Array<void>) => I;
export type Fn9<A, B, C, D, E, F, G, H, I, L> = (a: A, b: B, c: C, d: D, e: E, f: F, g: G, h: H, i: I, ...rest: Array<void>) => L;
export type CurriedFn2<A, B, C> =
& Fn1<A, Fn1<B, C>>
& Fn2<A, B, C>;
export type CurriedFn3<A, B, C, D> =
& Fn1<A, CurriedFn2<B, C, D>>
& Fn2<A, B, Fn1<C, D>>
& Fn3<A, B, C, D>;
export type CurriedFn4<A, B, C, D, E> =
& Fn1<A, CurriedFn3<B, C, D, E>>
& Fn2<A, B, CurriedFn2<C, D, E>>
& Fn3<A, B, C, Fn1<D, E>>
& Fn4<A, B, C, D, E>;
export type CurriedFn5<A, B, C, D, E, F> =
& Fn1<A, CurriedFn4<B, C, D, E, F>>
& Fn2<A, B, CurriedFn3<C, D, E, F>>
& Fn3<A, B, C, CurriedFn2<D, E, F>>
& Fn4<A, B, C, D, Fn1<E, F>>
& Fn5<A, B, C, D, E, F>;
export function curry<A, B, C>(f: Fn2<A, B, C>): CurriedFn2<A, B, C>;
export function curry<A, B, C, D>(f: Fn3<A, B, C, D>): CurriedFn3<A, B, C, D>;
export function curry<A, B, C, D, E>(f: Fn4<A, B, C, D, E>): CurriedFn4<A, B, C, D, E>;
export function curry<A, B, C, D, E, F>(f: Fn5<A, B, C, D, E, F>): CurriedFn5<A, B, C, D, E, F>;
export function curry<T>(fn: Variadic<T>): Variadic<T> {
return curryN(fn.length, fn);
}
export function curryN<A, B, C>(times: number, f: Fn2<A, B, C>): CurriedFn2<A, B, C>;
export function curryN<A, B, C, D>(times: number, f: Fn3<A, B, C, D>): CurriedFn3<A, B, C, D>;
export function curryN<A, B, C, D, E>(times: number, f: Fn4<A, B, C, D, E>): CurriedFn4<A, B, C, D, E>;
export function curryN<A, B, C, D, E, F>(times: number, f: Fn5<A, B, C, D, E, F>): CurriedFn5<A, B, C, D, E, F>;
export function curryN<T>(times: number, fn: Variadic<T>): Variadic<T> {
return arity(fn.length, function wrap(this: any, ...args: any[]) {
if (args.length < times) {
return arity(times - args.length, function (this: any, ...moreArgs: any[]) {
return wrap.apply(this, args.concat(moreArgs))
});
}
return fn.apply(this, args);
});
}
export function identity<A>(a: A): A {
return a;
}
export function compose<V0, T1>(fn0: (x0: V0) => T1): (x0: V0) => T1;
export function compose<V0, V1, T1>(fn0: (x0: V0, x1: V1) => T1): (x0: V0, x1: V1) => T1;
export function compose<V0, V1, V2, T1>(fn0: (x0: V0, x1: V1, x2: V2) => T1): (x0: V0, x1: V1, x2: V2) => T1;
export function compose<V0, V1, V2, V3, T1>(fn0: (x0: V0, x1: V1, x2: V2, x3: V3) => T1): (x0: V0, x1: V1, x2: V2, x3: V3) => T1;
export function compose<V0, T1, T2>(fn1: (x: T1) => T2, fn0: (x0: V0) => T1): (x0: V0) => T2;
export function compose<V0, V1, T1, T2>(fn1: (x: T1) => T2, fn0: (x0: V0, x1: V1) => T1): (x0: V0, x1: V1) => T2;
export function compose<V0, V1, V2, T1, T2>(fn1: (x: T1) => T2, fn0: (x0: V0, x1: V1, x2: V2) => T1): (x0: V0, x1: V1, x2: V2) => T2;
export function compose<V0, V1, V2, V3, T1, T2>(fn1: (x: T1) => T2, fn0: (x0: V0, x1: V1, x2: V2, x3: V3) => T1): (x0: V0, x1: V1, x2: V2, x3: V3) => T2;
export function compose<V0, T1, T2, T3>(fn2: (x: T2) => T3, fn1: (x: T1) => T2, fn0: (x0: V0) => T1): (x0: V0) => T3;
export function compose<V0, V1, T1, T2, T3>(fn2: (x: T2) => T3, fn1: (x: T1) => T2, fn0: (x0: V0, x1: V1) => T1): (x0: V0, x1: V1) => T3;
export function compose<V0, V1, V2, T1, T2, T3>(fn2: (x: T2) => T3, fn1: (x: T1) => T2, fn0: (x0: V0, x1: V1, x2: V2) => T1): (x0: V0, x1: V1, x2: V2) => T3;
export function compose<V0, V1, V2, V3, T1, T2, T3>(fn2: (x: T2) => T3, fn1: (x: T1) => T2, fn0: (x0: V0, x1: V1, x2: V2, x3: V3) => T1): (x0: V0, x1: V1, x2: V2, x3: V3) => T3;
export function compose<V0, T1, T2, T3, T4>(fn3: (x: T3) => T4, fn2: (x: T2) => T3, fn1: (x: T1) => T2, fn0: (x0: V0) => T1): (x0: V0) => T4;
export function compose<V0, V1, T1, T2, T3, T4>(fn3: (x: T3) => T4, fn2: (x: T2) => T3, fn1: (x: T1) => T2, fn0: (x0: V0, x1: V1) => T1): (x0: V0, x1: V1) => T4;
export function compose<V0, V1, V2, T1, T2, T3, T4>(fn3: (x: T3) => T4, fn2: (x: T2) => T3, fn1: (x: T1) => T2, fn0: (x0: V0, x1: V1, x2: V2) => T1): (x0: V0, x1: V1, x2: V2) => T4;
export function compose<V0, V1, V2, V3, T1, T2, T3, T4>(fn3: (x: T3) => T4, fn2: (x: T2) => T3, fn1: (x: T1) => T2, fn0: (x0: V0, x1: V1, x2: V2, x3: V3) => T1): (x0: V0, x1: V1, x2: V2, x3: V3) => T4;
export function compose<V0, T1, T2, T3, T4, T5>(fn4: (x: T4) => T5, fn3: (x: T3) => T4, fn2: (x: T2) => T3, fn1: (x: T1) => T2, fn0: (x0: V0) => T1): (x0: V0) => T5;
export function compose<V0, V1, T1, T2, T3, T4, T5>(fn4: (x: T4) => T5, fn3: (x: T3) => T4, fn2: (x: T2) => T3, fn1: (x: T1) => T2, fn0: (x0: V0, x1: V1) => T1): (x0: V0, x1: V1) => T5;
export function compose<V0, V1, V2, T1, T2, T3, T4, T5>(fn4: (x: T4) => T5, fn3: (x: T3) => T4, fn2: (x: T2) => T3, fn1: (x: T1) => T2, fn0: (x0: V0, x1: V1, x2: V2) => T1): (x0: V0, x1: V1, x2: V2) => T5;
export function compose<V0, V1, V2, V3, T1, T2, T3, T4, T5>(fn4: (x: T4) => T5, fn3: (x: T3) => T4, fn2: (x: T2) => T3, fn1: (x: T1) => T2, fn0: (x0: V0, x1: V1, x2: V2, x3: V3) => T1): (x0: V0, x1: V1, x2: V2, x3: V3) => T5;
export function compose<V0, T1, T2, T3, T4, T5, T6>(fn5: (x: T5) => T6, fn4: (x: T4) => T5, fn3: (x: T3) => T4, fn2: (x: T2) => T3, fn1: (x: T1) => T2, fn0: (x0: V0) => T1): (x0: V0) => T6;
export function compose<V0, V1, T1, T2, T3, T4, T5, T6>(fn5: (x: T5) => T6, fn4: (x: T4) => T5, fn3: (x: T3) => T4, fn2: (x: T2) => T3, fn1: (x: T1) => T2, fn0: (x0: V0, x1: V1) => T1): (x0: V0, x1: V1) => T6;
export function compose<V0, V1, V2, T1, T2, T3, T4, T5, T6>(fn5: (x: T5) => T6, fn4: (x: T4) => T5, fn3: (x: T3) => T4, fn2: (x: T2) => T3, fn1: (x: T1) => T2, fn0: (x0: V0, x1: V1, x2: V2) => T1): (x0: V0, x1: V1, x2: V2) => T6;
export function compose<V0, V1, V2, V3, T1, T2, T3, T4, T5, T6>(fn5: (x: T5) => T6, fn4: (x: T4) => T5, fn3: (x: T3) => T4, fn2: (x: T2) => T3, fn1: (x: T1) => T2, fn0: (x0: V0, x1: V1, x2: V2, x3: V3) => T1): (x0: V0, x1: V1, x2: V2, x3: V3) => T6;
export function compose<V0, T1, T2, T3, T4, T5, T6, T7>(fn6: (x: T6) => T7, fn5: (x: T5) => T6, fn4: (x: T4) => T5, fn3: (x: T3) => T4, fn2: (x: T2) => T3, fn1: (x: T1) => T2, fn0: (x0: V0) => T1): (x0: V0) => T7;
export function compose<V0, V1, T1, T2, T3, T4, T5, T6, T7>(fn6: (x: T6) => T7, fn5: (x: T5) => T6, fn4: (x: T4) => T5, fn3: (x: T3) => T4, fn2: (x: T2) => T3, fn1: (x: T1) => T2, fn0: (x0: V0, x1: V1) => T1): (x0: V0, x1: V1) => T7;
export function compose<V0, V1, V2, T1, T2, T3, T4, T5, T6, T7>(fn6: (x: T6) => T7, fn5: (x: T5) => T6, fn4: (x: T4) => T5, fn3: (x: T3) => T4, fn2: (x: T2) => T3, fn1: (x: T1) => T2, fn0: (x0: V0, x1: V1, x2: V2) => T1): (x0: V0, x1: V1, x2: V2) => T7;
export function compose<V0, V1, V2, V3, T1, T2, T3, T4, T5, T6, T7>(fn6: (x: T6) => T7, fn5: (x: T5) => T6, fn4: (x: T4) => T5, fn3: (x: T3) => T4, fn2: (x: T2) => T3, fn1: (x: T1) => T2, fn0: (x0: V0, x1: V1, x2: V2, x3: V3) => T1): (x0: V0, x1: V1, x2: V2, x3: V3) => T7;
export function compose<V0, T1, T2, T3, T4, T5, T6, T7, T8>(fn7: (x: T7) => T8, fn6: (x: T6) => T7, fn5: (x: T5) => T6, fn4: (x: T4) => T5, fn3: (x: T3) => T4, fn2: (x: T2) => T3, fn1: (x: T1) => T2, fn0: (x0: V0) => T1): (x0: V0) => T8;
export function compose<V0, V1, T1, T2, T3, T4, T5, T6, T7, T8>(fn7: (x: T7) => T8, fn6: (x: T6) => T7, fn5: (x: T5) => T6, fn4: (x: T4) => T5, fn3: (x: T3) => T4, fn2: (x: T2) => T3, fn1: (x: T1) => T2, fn0: (x0: V0, x1: V1) => T1): (x0: V0, x1: V1) => T8;
export function compose<V0, V1, V2, T1, T2, T3, T4, T5, T6, T7, T8>(fn7: (x: T7) => T8, fn6: (x: T6) => T7, fn5: (x: T5) => T6, fn4: (x: T4) => T5, fn3: (x: T3) => T4, fn2: (x: T2) => T3, fn1: (x: T1) => T2, fn0: (x0: V0, x1: V1, x2: V2) => T1): (x0: V0, x1: V1, x2: V2) => T8;
export function compose<V0, V1, V2, V3, T1, T2, T3, T4, T5, T6, T7, T8>(fn7: (x: T7) => T8, fn6: (x: T6) => T7, fn5: (x: T5) => T6, fn4: (x: T4) => T5, fn3: (x: T3) => T4, fn2: (x: T2) => T3, fn1: (x: T1) => T2, fn0: (x0: V0, x1: V1, x2: V2, x3: V3) => T1): (x0: V0, x1: V1, x2: V2, x3: V3) => T8;
export function compose<V0, T1, T2, T3, T4, T5, T6, T7, T8, T9>(fn8: (x: T8) => T9, fn7: (x: T7) => T8, fn6: (x: T6) => T7, fn5: (x: T5) => T6, fn4: (x: T4) => T5, fn3: (x: T3) => T4, fn2: (x: T2) => T3, fn1: (x: T1) => T2, fn0: (x0: V0) => T1): (x0: V0) => T9;
export function compose<V0, V1, T1, T2, T3, T4, T5, T6, T7, T8, T9>(fn8: (x: T8) => T9, fn7: (x: T7) => T8, fn6: (x: T6) => T7, fn5: (x: T5) => T6, fn4: (x: T4) => T5, fn3: (x: T3) => T4, fn2: (x: T2) => T3, fn1: (x: T1) => T2, fn0: (x0: V0, x1: V1) => T1): (x0: V0, x1: V1) => T9;
export function compose<V0, V1, V2, T1, T2, T3, T4, T5, T6, T7, T8, T9>(fn8: (x: T8) => T9, fn7: (x: T7) => T8, fn6: (x: T6) => T7, fn5: (x: T5) => T6, fn4: (x: T4) => T5, fn3: (x: T3) => T4, fn2: (x: T2) => T3, fn1: (x: T1) => T2, fn0: (x0: V0, x1: V1, x2: V2) => T1): (x0: V0, x1: V1, x2: V2) => T9;
export function compose<V0, V1, V2, V3, T1, T2, T3, T4, T5, T6, T7, T8, T9>(fn8: (x: T8) => T9, fn7: (x: T7) => T8, fn6: (x: T6) => T7, fn5: (x: T5) => T6, fn4: (x: T4) => T5, fn3: (x: T3) => T4, fn2: (x: T2) => T3, fn1: (x: T1) => T2, fn0: (x0: V0, x1: V1, x2: V2, x3: V3) => T1): (x0: V0, x1: V1, x2: V2, x3: V3) => T9;
export function compose(...fns: Function[]): Function {
return pipe.apply(null, fns.reverse());
}
function pipe(...fns: Function[]): Function {
return arity(fns[0].length, function (this: any, ...args: any[]) {
switch (fns.length) {
case 0:
throw new Error('pipe requires at least one argument');
case 1:
return fns[0].apply(this, args);
default:
return fns.slice(1).reduce((acc, fn) => {
return fn.call(this, acc);
}, fns[0].apply(this, args));
}
});
}
function arity<T>(n: number, fn: Variadic<T>): Variadic<T> {
switch (n) {
case 0: return function(this: any, ) { return fn.apply(this, arguments); };
case 1: return function(this: any,a0) { return fn.apply(this, arguments); };
case 2: return function(this: any,a0, a1) { return fn.apply(this, arguments); };
case 3: return function(this: any,a0, a1, a2) { return fn.apply(this, arguments); };
case 4: return function(this: any,a0, a1, a2, a3) { return fn.apply(this, arguments); };
case 5: return function(this: any,a0, a1, a2, a3, a4) { return fn.apply(this, arguments); };
case 6: return function(this: any,a0, a1, a2, a3, a4, a5) { return fn.apply(this, arguments); };
case 7: return function(this: any,a0, a1, a2, a3, a4, a5, a6) { return fn.apply(this, arguments); };
case 8: return function(this: any,a0, a1, a2, a3, a4, a5, a6, a7) { return fn.apply(this, arguments); };
case 9: return function(this: any,a0, a1, a2, a3, a4, a5, a6, a7, a8) { return fn.apply(this, arguments); };
case 10: return function(this: any,a0, a1, a2, a3, a4, a5, a6, a7, a8, a9) { return fn.apply(this, arguments); };
default: throw new Error('First argument to _arity must be a non-negative integer no greater than ten');
}
}
export function unique<T>(fn: (value: T) => any) {
return (array: T[]): T[] => {
return array
.map(it => ({item: it, value: fn(it)}))
.reduce((acc, it) => {
return (acc.find(x => x.value === it.value)) ?
acc : acc.concat(it);
}, [] as {item: T, value: any}[])
.map(it => it.item);
};
}
export function diff<T>(fn: (value: T) => any, arrayA: T[]) {
return (arrayB: T[]): [T[], T[], T[]] => {
return [
arrayA.filter(a => !arrayB.find(b => fn(a) === fn(b))),
arrayA.filter(a => !!arrayB.find(b => fn(a) === fn(b))),
arrayB.filter(b => !arrayA.find(a => fn(a) === fn(b)))
];
};
}
export function isPromise<A>(obj: any): obj is Promise<A> {
return !!obj && (typeof obj === 'object' || typeof obj === 'function') && typeof obj.then === 'function';
}