Predicate based methods

TIP

declare function all(predicate: string|Predicate<DomElementType>, ...args: any[]): boolean;
declare function any(predicate: string|Predicate<DomElementType>, ...args: any[]): boolean;
declare function none(predicate: string|Predicate<DomElementType>, ...args: any[]): boolean;
declare function notAll(predicate: string|Predicate<DomElementType>, ...args: any[]): boolean;

The methods help "counting" the items that satisfy the given predicate. You can use a method-string invokable as your predicate (cf. design). They all support short-circuiting.

all

Allows determining whether or not all the elements satisfy the given predicate. It is analog to Array#every.

µ(":input")
.map(el => getFormFieldHandle(el))
.all(e => e.valid());

any

Allows determining whether or not at least one of the elements satisfy the given predicate. It is analog to Array#some.

µ(":checkbox[required]")
.any(e => !e.checked);

none

Allows determining whether or not none of the elements satisfy the given predicate.

µ(":input")
.map(el => getFormFieldHandle(el))
.none(e => e.hasErrors());

notAll

Allows determining whether or not some of the elements do not satisfy the given predicate.

µ("[data-alternative]")
.map(el => getFormFieldHandle(el))
.notAll(e => e.hasErrors());