macoolka-predicate

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Overview

Logic function about predicate

Table of contents

and (function)

Concat Predicate with and

Signature


export const and = <A>(p1: Predicate<A>, p2: Predicate<A>): Predicate<A> => ...

Example

import { and } from 'macoolka-predicate'
interface A {
  name: string
  age: number
}
const as: A[] = [{ name: 'a1', age: 20 }, { name: 'a2', age: 20 }, { name: 'a3', age: 28 }]
const isName = (a: A) => a.name === 'a1'
const isAge = (a: A) => a.age === 20
expect(as.filter(and(isName, isAge)).length).toEqual(1)

Added in v0.2.0

foldAND (function)

fold Predicate with and

Signature


export const foldAND = <A>(p: Array<Predicate<A>>): Predicate<A> => ...

Example

import { foldAND } from 'macoolka-predicate'
interface A {
  name: string
  age: number
}
const as: A[] = [{ name: 'a1', age: 20 }, { name: 'a2', age: 20 }, { name: 'a3', age: 28 }]
const isName = (a: A) => a.name === 'a1'
const isAge = (a: A) => a.age === 20
expect(as.filter(foldAND([isName, isAge])).length).toEqual(1)

Added in v0.2.0

foldOR (function)

fold Predicate with or

Signature


export const foldOR = <A>(p: Array<Predicate<A>>): Predicate<A> => ...

Example

import { foldOR } from 'macoolka-predicate'
interface A {
  name: string
  age: number
}
const as: A[] = [{ name: 'a1', age: 20 }, { name: 'a2', age: 20 }, { name: 'a3', age: 28 }]
const isName = (a: A) => a.name === 'a1'
const isAge = (a: A) => a.age === 20
expect(as.filter(foldOR([isName, isAge])).length).toEqual(2)

Added in v0.2.0

not (function)

not a Predicate

Example

import { and } from 'macoolka-predicate'
interface A {
  name: string
  age: number
}
const as: A[] = [{ name: 'a1', age: 20 }, { name: 'a2', age: 20 }, { name: 'a3', age: 28 }]
const isName = (a: A) => a.name === 'a1'
const isAge = (a: A) => a.age === 20
expect(as.filter(and(isName, isAge)).length).toEqual(1)

Added in v0.2.0

or (function)

Concat Predicate with or

Example

import { or } from 'macoolka-predicate'
interface A {
  name: string
  age: number
}
const as: A[] = [{ name: 'a1', age: 20 }, { name: 'a2', age: 20 }, { name: 'a3', age: 28 }]
const isName = (a: A) => a.name === 'a1'
const isAge = (a: A) => a.age === 20
expect(as.filter(or(isName, isAge)).length).toEqual(2)

Added in v0.2.0