apply-or

apply-or

Invoke .apply if value is a function, otherwise, return default value.

npm install apply-or --save

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Why?

Function.prototype.apply is normally sufficient; however, there are situations where it is useful to treat a value as a Function (invoke it) only if it is indeed a Function; otherwise, return it as-is. Calling .apply on a value that is not a function would cause an error.

Examples

delay.js

var apply = require('apply-or')

function delay (cb) {
  setTimeout(apply.bind(null, cb))
}

delay('Hello') // does nothing (because argument is not a function)
delay(console.log.bind(console, 'Hello, World')) // prints 'Hello, World' to stdout

divmax.js

var apply = require('apply-or')

function divmax (divisor) {
  return Math.max.apply(null, this.val) / divisor
}

var data = {
  val: [9, 7, 15, 12]
}

apply(divmax, 5, data)
//=> divmax.apply({ val: [9, 7, 15, 12] }, [5])
//=> 15 / 5
//=> 3

API

apply(func, args, self)

arguments

• func: (Function) Function to be invoked.
• args: (Array|*) Arguments to apply to function.
• self: (Object) this value.

returns

• (*) Result of applying function or default value.

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