Showing content from https://gist.github.com/getify/5253319 below:
exploring what a `currentThis` might look like in JS ยท GitHub
// This is a theoretical exploration of something that could // be added to JS. It borrows from JS events which have both a // `target` and `currentTarget` element, which distinguish between // the direct target of an event and the delegated parent handling // the event, respectively. // The idea is to distinguish between `this` and `currentThis`, // respectively, as... // // `this`: the initial containing object for a call that initiates a // traversal of the [[Prototype]] chain (just as it currently does) // // `currentThis`: the actual link in the [[Prototype]] chain where the // traversal resolution is completed. // Notice below that with `bar1` for example, `this` will point to // `bar1` even when using the delegated `identify()` function found // on `Foo`, but `currentThis` will point to `Foo`, since that's // where `identify()` was found in the chain. // So... what if: var Foo = Object.create(null); Foo.me = "Foo"; Foo.identify = function() { // whenever Foo#identify() is called, `currentThis` will // always be `Foo`, but `this` will continue to follow the // established rules for determining a `this` binding. console.log("Me: " + this.me + "; Current: " + currentThis.me); }; var Bar = Object.create(Foo); Bar.me = "Bar"; Bar.another = function() { console.log("Current: " + currentThis.me); } var bar1 = Object.create(Bar); bar1.me = "bar1"; var bar2 = Object.create(Bar); bar2.me = "bar2"; Foo.identify(); // "Me: Foo; Current: Foo" Bar.identify(); // "Me: Bar; Current: Foo" Bar.another(); // "Current: Bar" bar1.identify(); // "Me: bar1; Current: Foo" bar2.identify(); // "Me: bar2; Current: Foo" bar1.another(); // "Current: Bar" bar2.another(); // "Current: Bar"
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