Possibly worth mentioning: If you use `super` then Object.defineProperty() does not work, only Object.assign() and Object.mixin() update [[HomeObject]]. AFAIK, we don’t have Object.defineMethod() yet (maybe ever).
On Mar 25, 2013, at 19:09 , Allen Wirfs-Brock <[email protected]> wrote: > > On Mar 25, 2013, at 1:57 AM, Claude Pache wrote: > >> >> Le 25 mars 2013 à 08:28, Axel Rauschmayer <[email protected]> a écrit : >> >>> 2. Function expressions --> arrow functions >> >> No, it depends. Roughly, I would replace function expressions by arrow >> functions when I want to use the 'this' binding of the enclosing scope (or >> don't use the 'this' binding), and the body is short. >> >> Random counter-example from my ES6 polyfill: >> >> if (typeof String.prototype.contains !== 'function') { >> String.prototype.contains = function(x, p) { >> return this.indexOf(x, p) !== -1 >> } >> Object.defineProperty(String.prototype, 'contains', {enumerable: >> false}) >> } >> >> I could not use an arrow expression (even if it existed in ES5) because I >> need a proper 'this' binding. In fact, I could hardly use anything else than >> a function expression. > > You could use a concise method: > > > if (typeof String.prototype.contains !== 'function') { > String.prototype.contains = {contains(x, p) {return this.indexOf(x, p) > !== -1}}.contains; > } > Object.defineProperty(String.prototype, 'contains', {enumerable: false}) > > or > if (typeof String.prototype.contains !== 'function') { > Object.assign(String.prototype, {contains(x, p) {return this.indexOf(x, > p) !== -1}}); //or Object.mixin > } > Object.defineProperty(String.prototype, 'contains', {enumerable: false}) > } > > Allen > > -- Dr. Axel Rauschmayer [email protected] home: rauschma.de twitter: twitter.com/rauschma blog: 2ality.com
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