Function constructor: Function.prototype

The Function prototype contains all methods and properties of a function

the specified methods and props

const ownPropertyNames = Object.getOwnPropertyNames(Function.prototype); ['length', 'name', 'constructor', 'apply', 'bind', 'call', 'toString'] .forEach(name => assert(ownPropertyNames.includes(name), `Failed to find "${name}".`));

the old/deprecated/inofficial methods and props

const ownPropertyNames = Object.getOwnPropertyNames(Function.prototype); ['arguments', 'caller'] .forEach(name => assert(ownPropertyNames.includes(name), `Failed to find "${name}".`));

Links

spec docs The very first version of the spec defines this property already, the ES1 spec, see section 15.3.4 (PDF 732kB).

Related Katas

function API

• function.length (as introduced in ES1)
• function.bind()
• function.length (with ES5 features)
• function.length (with ES6 features)
• function.name

Arrow functions

• basics
• function binding

Async Function

• basics

Difficulty Level

BEGINNER

Stats

2 tests to solve