#when

Returns a function that applies a transform only when a predicate passes, otherwise returns the value unchanged.

const trimIfString = when(isString, (s: string) => s.trim())
trimIfString('  hello  ') // 'hello'

#Usage

#when<T>(predicate: (value: T) => boolean, fn: (value: T) => T)

Returns a function that applies a transform only when a predicate passes, otherwise returns the value unchanged.

import { when } from 'massaman'
// or:  import { when } from 'massaman/function'

const trimIfString = when(isString, (s: string) => s.trim())
trimIfString('  hello  ') // 'hello'

#Parameters

#Returns

a function that transforms values only when predicate returns true.

(value: T) => T