Using the following example from the MDN documentation for Arrow functions, at https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Functions/Arrow_functions
function Person(){
this.age = 0;
setInterval(() => {
this.age++; // |this| properly refers to the person object
}, 1000);
}
var p = new Person();
When I copy/paste that code into node.js 0.12 node --harmony, the this.age++; line doesn't seem to be referring to Person context, but rather the setInterval context. Adding console.log(this) to the callback seems to confirm that.
When I've used other es6->es5 transpilers, it has always worked as expected. Is this a bug in node.js? Am I missing something?
edit: perhaps this is the reason? ES6 arrow function lexical this in V8
Difference is, they're discussing Chrome while this question is about Node.js. According to http://kangax.github.io/compat-table/es6/#arrow_functions they have different levels of ES6 support even though they both use V8.
Seems like the reason is that V8 has not updated to support lexical this yet.
Collected from the Internet
Please contact [email protected] to delete if infringement.
Comments