take-while

v0.9.6

STATUS

Passing

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VISIBILITY

Public

PUBLISHED

5 years ago

SIZE

1 KB

Returns a new list containing the first `n` elements of a given list,

Boolean

List

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takeWhile (

fn:Function,

xs:Array

) : Array

Returns a new list containing the first n elements of a given list, passing each value to the supplied predicate function, and terminating when the predicate function returns false. Excludes the element that caused the predicate function to fail. The predicate function is passed one argument: (value).

Dispatches to the takeWhile method of the second argument, if present.

Acts as a transducer if a transformer is given in list position.

Example

const isNotFour = x => x !== 4;

     R.takeWhile(isNotFour, [1, 2, 3, 4, 3, 2, 1]); //=> [1, 2, 3]

     R.takeWhile(x => x !== 'd' , 'Ramda'); //=> 'Ram'

Arguments

fn: Function

The function called per iteration.

xs: Array

The collection to iterate over.

Returns

Array

A new array.