feat: add memoize function

Author: tdreyno

src/__tests__/and.spec.ts src/core/__tests__/and.spec.ts

@@ -0,0 +1,131 @@
+/* eslint-disable @typescript-eslint/no-explicit-any */
+export const index = (i: number) => <T>(items: T[]): T | undefined => items[i]
+
+export const nth = (n: number) => index(n - 1)
+
+export const first = index(0)
+
+export const last = <T>(items: T[]): T => items[items.length - 1]
+
+export const rest = <T>([, ...remaining]: T[]) => remaining
+
+export const constant = <T>(value: T) => () => value
+
+export const identity = <T>(value: T) => value
+
+export const not = <Args extends any[], T>(fn: (...args: Args) => T) => (
+  ...args: Args
+) => !fn(...args)
+
+export const equals = <T>(value: T) => (data: T): boolean => value === data
+
+export const greaterThan = (value: number) => (data: number): boolean =>
+  data > value
+
+export const greaterThanEquals = (value: number) => (data: number): boolean =>
+  data >= value
+
+export const lessThan = (value: number) => (data: number): boolean =>
+  data < value
+
+export const lessThanEquals = (value: number) => (data: number): boolean =>
+  data <= value
+
+export const or = <Args extends any[]>(
+  ...options: Array<(...args: Args) => unknown>
+) => (...args: Args): boolean => options.some(fn => fn(...args))
+
+export const and = <Args extends any[]>(
+  ...options: Array<(...args: Args) => unknown>
+) => (...args: Args): boolean => options.every(fn => fn(...args))
+
+export const isBetween = (a: number, b: number, inclusive = false) =>
+  inclusive
+    ? and(greaterThanEquals(a), lessThanEquals(b))
+    : and(greaterThan(a), lessThan(b))
+
+export const pluck = <U, T extends keyof U>(key: T) => (data: U): U[T] =>
+  data[key]
+
+export const omit = <U, T extends keyof U>(key: T) => (data: U): Omit<U, T> => {
+  const cloned = { ...data }
+  delete cloned[key]
+  return cloned
+}
+
+export function pipe<A, B, C, D, E>(
+  a: (data: A) => B,
+  b: (data: B) => C,
+  c: (data: C) => D,
+  d: (data: D) => E,
+): (data: A) => E
+export function pipe<A, B, C, D>(
+  a: (data: A) => B,
+  b: (data: B) => C,
+  c: (data: C) => D,
+): (data: A) => D
+export function pipe<A, B, C>(
+  a: (data: A) => B,
+  b: (data: B) => C,
+): (data: A) => C
+export function pipe(...fns: ((data: any) => any)[]) {
+  return (data: any) => fns.reduce((sum, fn) => fn(sum), data)
+}
+
+export function apply<T, A>(fn: (a: A) => T): (data: [A]) => T
+export function apply<T, A, B>(fn: (a: A, b: B) => T): (data: [A, B]) => T
+export function apply<T, A, B, C>(
+  fn: (a: A, b: B, c: C) => T,
+): (data: [A, B, C]) => T
+export function apply<T>(fn: (...args: any[]) => T): (args: any) => T {
+  return (args: any) => fn(...args)
+}
+
+export const map = <T, U>(fn: (a: T) => U) => (data: T[]): U[] => data.map(fn)
+export const chain = <T, U>(fn: (a: T) => U) => (data: T): U => fn(data)
+
+type Predicate<T> = (data: T) => unknown
+type Transform<T, U> = (data: T) => U
+type Condition<T, U> = [Predicate<T>, Transform<T, U>]
+
+export function cond<T, U>(
+  conditions: Condition<T, U>[],
+): (data: T) => U | undefined
+export function cond<T, U>(
+  conditions: Condition<T, U>[],
+  orElse: Transform<T, U>,
+): (data: T) => U
+export function cond<T, U>(
+  conditions: Condition<T, U>[],
+  orElse?: Transform<T, U>,
+): (data: T) => U | undefined {
+  return (data: T) => {
+    const found = conditions.find(([predicate]) => predicate(data))
+
+    if (found) {
+      return found[1](data)
+    }
+
+    return orElse ? orElse(data) : undefined
+  }
+}
+
+export function isPlainObject(obj: unknown) {
+  // Basic check for Type object that's not null
+  if (typeof obj == "object" && obj !== null) {
+    // If Object.getPrototypeOf supported, use it
+    if (typeof Object.getPrototypeOf == "function") {
+      const proto = Object.getPrototypeOf(obj)
+      return proto === Object.prototype || proto === null
+    }
+
+    // Otherwise, use internal class
+    // This should be reliable as if getPrototypeOf not supported, is pre-ES5
+    return Object.prototype.toString.call(obj) == "[object Object]"
+  }
+
+  // Not an object
+  return false
+}
+
+export const isUndefined = (data: unknown) => data === undefined

src/__tests__/apply.spec.ts src/core/__tests__/apply.spec.ts

@@ -1,111 +1,2 @@
-/* eslint-disable @typescript-eslint/no-explicit-any */
-export const index = (i: number) => <T>(items: T[]): T | undefined => items[i]
-
-export const nth = (n: number) => index(n - 1)
-
-export const first = index(0)
-
-export const last = <T>(items: T[]): T => items[items.length - 1]
-
-export const rest = <T>([, ...remaining]: T[]) => remaining
-
-export const constant = <T>(value: T) => () => value
-
-export const identity = <T>(value: T) => value
-
-export const not = <Args extends any[], T>(fn: (...args: Args) => T) => (
-  ...args: Args
-) => !fn(...args)
-
-export const equals = <T>(value: T) => (data: T): boolean => value === data
-
-export const greaterThan = (value: number) => (data: number): boolean =>
-  data > value
-
-export const greaterThanEquals = (value: number) => (data: number): boolean =>
-  data >= value
-
-export const lessThan = (value: number) => (data: number): boolean =>
-  data < value
-
-export const lessThanEquals = (value: number) => (data: number): boolean =>
-  data <= value
-
-export const or = <Args extends any[]>(
-  ...options: Array<(...args: Args) => unknown>
-) => (...args: Args): boolean => options.some(fn => fn(...args))
-
-export const and = <Args extends any[]>(
-  ...options: Array<(...args: Args) => unknown>
-) => (...args: Args): boolean => options.every(fn => fn(...args))
-
-export const isBetween = (a: number, b: number, inclusive = false) =>
-  inclusive
-    ? and(greaterThanEquals(a), lessThanEquals(b))
-    : and(greaterThan(a), lessThan(b))
-
-export const pluck = <U, T extends keyof U>(key: T) => (data: U): U[T] =>
-  data[key]
-
-export const omit = <U, T extends keyof U>(key: T) => (data: U): Omit<U, T> => {
-  const cloned = { ...data }
-  delete cloned[key]
-  return cloned
-}
-
-export function pipe<A, B, C, D, E>(
-  a: (data: A) => B,
-  b: (data: B) => C,
-  c: (data: C) => D,
-  d: (data: D) => E,
-): (data: A) => E
-export function pipe<A, B, C, D>(
-  a: (data: A) => B,
-  b: (data: B) => C,
-  c: (data: C) => D,
-): (data: A) => D
-export function pipe<A, B, C>(
-  a: (data: A) => B,
-  b: (data: B) => C,
-): (data: A) => C
-export function pipe(...fns: ((data: any) => any)[]) {
-  return (data: any) => fns.reduce((sum, fn) => fn(sum), data)
-}
-
-export function apply<T, A>(fn: (a: A) => T): (data: [A]) => T
-export function apply<T, A, B>(fn: (a: A, b: B) => T): (data: [A, B]) => T
-export function apply<T, A, B, C>(
-  fn: (a: A, b: B, c: C) => T,
-): (data: [A, B, C]) => T
-export function apply<T>(fn: (...args: any[]) => T): (args: any) => T {
-  return (args: any) => fn(...args)
-}
-
-export const map = <T, U>(fn: (a: T) => U) => (data: T[]): U[] => data.map(fn)
-export const chain = <T, U>(fn: (a: T) => U) => (data: T): U => fn(data)
-
-type Predicate<T> = (data: T) => unknown
-type Transform<T, U> = (data: T) => U
-type Condition<T, U> = [Predicate<T>, Transform<T, U>]
-
-export function cond<T, U>(
-  conditions: Condition<T, U>[],
-): (data: T) => U | undefined
-export function cond<T, U>(
-  conditions: Condition<T, U>[],
-  orElse: Transform<T, U>,
-): (data: T) => U
-export function cond<T, U>(
-  conditions: Condition<T, U>[],
-  orElse?: Transform<T, U>,
-): (data: T) => U | undefined {
-  return (data: T) => {
-    const found = conditions.find(([predicate]) => predicate(data))
-
-    if (found) {
-      return found[1](data)
-    }
-
-    return orElse ? orElse(data) : undefined
-  }
-}
+export * from "./core/index"
+export * from "./memo/index"