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paul-jean/test-scoping.js

Created February 19, 2014 18:09
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Playing with scopes in JS
Raw
test-scoping.js
var g = 5;
console.log("Global value of g = " + g); // g: 5
var x = function() {
g = 10;
};
var y = new x();
console.log("After y = new x(), g = " + g); // g: 10
console.log("After y = new x(), y.g = " + y.g); // y.g: undefined
// ^^^ because x is referring to global g
var g = 5;
console.log("** Reset g ** ");
console.log("Global value of g = " + g); // g: 5
var z = function() {
this.g = 7;
};
var y = new z();
console.log("After y = new z(), g = " + g); // g: 5
console.log("After y = new z(), y.g = " + y.g); // z.g = 7
// ^^^ because z binds g to z's local scope using "this"
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