A method to determine if an argument is a callable function with a call method
npm install es-abstract-is-callableA method to determine if an argument is a callable function with a call method.
This method follows ECMAScript's specification for the 'IsCallable ' abstract
operation.
Currently, this module only supports the ES2017 (ES8) specification.
**This module follows the spec in order of operations, but has no way of
checking internal methods. It checks against public methods instead. You may be
interested in is-callable as an
alternative.**
``
npm install es-abstract-is-callable
`javascript
var isCallable = require('es-abstract-is-callable')
var a = {
yep: function() {},
nope: "foo"
}
function b() {}
var c = {
call: function() {}
}
console.log(isCallable(a)) // => false
console.log(isCallable(a.yep)) // => true
console.log(isCallable(a.nope)) // => false
console.log(isCallable(b)) // => true
console.log(isCallable(c)) // => true
`
- API
- ECMAScript Specification References
The abstract operation IsCallable determines if argument, which must be an
ECMAScript language value, is a callable function with a [[Call]] internal
method.
A Boolean value is returned.
#### argument
Type: *`
The value to check.
- is-callable: "Is this JS value
callable? Works with Functions and GeneratorFunctions, despite ES6
@@toStringTag."
- es-abstract: a single library
for multiple ECMAScript abstract operations.