JavaScript Inheritance

I summary JavaScript Inheritance methods, originally from Stoyan Stefanov.

| function extend(Child, Parent) { var F = function() {}; F.prototype = Parnt.prototype; Child.prototype = new F(); Child.prototype.constructor=Child; }

|   | | prototype + attributes copy |

function extend2(Child, Parent) { var p = Parent.prototype; var c = Child.prototype; for (var i in p) { c[i] = p[i]; } }

|   | | attributes copy |   |

function extendCopy(p) { var c = {}; for (var i in p) { c[i] = p[i]; } return c; }

| | attributes copy |   |

function deepCopy(p, c) { var c = c || {}; for (var i in p) { if(typeof p[i] === ‘object’) { c[i] = (p[i].constructor===Array)? [] : {}; deepCopy(p[i], c[i]); } else { c[i] = p[i]; } } return c; }

| | prototype |   |

function object(o) { function F() {}; F.prototype = o; return new F(); }

| | prototype + attributes copy |   |

function objectPlus(o, attrs) { var n = null; function F() {}; F.prototype = o; n = new F(); for(var i in attrs) { n[i] = attrs[i]; } return n; }

| | attributes copy |   |

function multi() { var n = {}, stuff, j = 0, len = arguments.length; for (j = 0; j < len; j++) { stuff = arguments[j]; for (var i in stuff) { n[i] = stuff[i]; } } return n; }

| | prototype |   |

function parasite(victim) {
var that = object(victim);
that.more = 1;
return that;
}

| |   |

function Child() { Parent.apply(this.arguments); }

|   | | prototype + attributes copy |

function Child() { Parent.apply(this, arguments); } extend2(Child, Parent);

|   |