<A>(collection: Iterable<Predicate<A>>): Predicate<A>Creates a predicate that returns true if all predicates in the collection return true.
When to use
Use when you have a dynamic list of predicates to apply.
Details
Evaluation short-circuits on the first false. The collection is iterated
each time the predicate is called.
Example (Checking all predicates)
import { Predicate } from "effect"
const allChecks = Predicate.every([Predicate.isNumber, (n: number) => n > 0])
console.log(allChecks(2))export function function every<A>(
collection: Iterable<Predicate<A>>
): Predicate<A>
Creates a predicate that returns true if all predicates in the collection return true.
When to use
Use when you have a dynamic list of predicates to apply.
Details
Evaluation short-circuits on the first false. The collection is iterated
each time the predicate is called.
Example (Checking all predicates)
import { Predicate } from "effect"
const allChecks = Predicate.every([Predicate.isNumber, (n: number) => n > 0])
console.log(allChecks(2))
every<function (type parameter) A in every<A>(collection: Iterable<Predicate<A>>): Predicate<A>A>(collection: Iterable<Predicate<A>>collection: interface Iterable<T, TReturn = any, TNext = any>Iterable<interface Predicate<in A>A function that decides whether a value of type A satisfies a condition.
When to use
Use when you want a reusable boolean check for A, especially when you plan
to combine checks with
and
/
or
or pass a predicate to arrays
and iterables.
Details
A predicate returns true or false and never throws by itself. It does not
narrow types unless you use Refinement.
Example (Defining a predicate)
import { Predicate } from "effect"
const isPositive: Predicate.Predicate<number> = (n) => n > 0
console.log(isPositive(1))
Type-level utilities for working with
Predicate
types.
When to use
Use when you need to extract input types from predicate signatures while
writing generic helpers over predicate types.
Details
These utilities are type-only, create no runtime values, and the namespace is
erased at runtime.
Example (Extracting predicate input)
import { Predicate } from "effect"
type IsString = Predicate.Predicate<string>
type Input = Predicate.Predicate.In<IsString>
Predicate<function (type parameter) A in every<A>(collection: Iterable<Predicate<A>>): Predicate<A>A>>): interface Predicate<in A>A function that decides whether a value of type A satisfies a condition.
When to use
Use when you want a reusable boolean check for A, especially when you plan
to combine checks with
and
/
or
or pass a predicate to arrays
and iterables.
Details
A predicate returns true or false and never throws by itself. It does not
narrow types unless you use Refinement.
Example (Defining a predicate)
import { Predicate } from "effect"
const isPositive: Predicate.Predicate<number> = (n) => n > 0
console.log(isPositive(1))
Type-level utilities for working with
Predicate
types.
When to use
Use when you need to extract input types from predicate signatures while
writing generic helpers over predicate types.
Details
These utilities are type-only, create no runtime values, and the namespace is
erased at runtime.
Example (Extracting predicate input)
import { Predicate } from "effect"
type IsString = Predicate.Predicate<string>
type Input = Predicate.Predicate.In<IsString>
Predicate<function (type parameter) A in every<A>(collection: Iterable<Predicate<A>>): Predicate<A>A> {
return (a: Aa) => {
for (const const p: Predicate<A>p of collection: Iterable<Predicate<A>>collection) {
if (!const p: Predicate<A>p(a: Aa)) {
return false
}
}
return true
}
}