foop
Version:
interfaces that describe their intentions.
36 lines (33 loc) • 3.25 kB
JavaScript
var isNill = require('./nullOrUndefined')
var isPrototypeOf = Object.prototype.isPrototypeOf
/**
* check if arg 1 is prototype of arg 2
*
* @TODO curry2
* @memberOf is
* @name isPrototypeOf
* @since 3.0.0
*
* @param {Object | *} haystack check needle against
* @param {Object | *} needle is prototype of haystack
* @return {boolean} needle isPrototypeOf haystack
*
* {@link https://tc39.github.io/ecma262/#sec-object.prototype.isprototypeof emca-is-prototype-of}
* {@link https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/isPrototypeOf mozilla-obj-isprototypeof}
* @see {@link mozilla-obj-isprototypeof}
* @see {@link emca-is-prototype-of}
*
* @example
*
* class Eh extends Function {}
* class Canada extends Eh {}
* isPrototypeOf(Eh, Function) //=> true
* isPrototypeOf(Canada, Function) //=> true
* isPrototypeOf(Eh, Date) //=> false
*
* isPrototypeOf({}, Object) //=> true
* isPrototypeOf({}, Array) //=> false
*
*/
module.exports = function (haystack, needle) { return !isNill(haystack) && isPrototypeOf.call(haystack, needle); }
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