It’s not like there is an official JavaScript release. All the browsers have made their own JavaScript engine – some are using the same though. But especially Internet Explorer has its own version that doesn’t support a lot of what the other browsers support, making it very difficult to make a general JavaScript reference. Edit: … Read more
Infinity and NaN aren’t keywords or anything special, they are just properties on the global object (as is undefined) and as such can be changed. It’s for that reason JSON doesn’t include them in the spec — in essence any true JSON string should have the same result in EcmaScript if you do eval(jsonString) or … Read more
Early versions of JavaScript did not allow named function expressions, and because of that we could not make a recursive function expression: // This snippet will work: function factorial(n) { return (!(n>1))? 1 : factorial(n-1)*n; } [1,2,3,4,5].map(factorial); // But this snippet will not: [1,2,3,4,5].map(function(n) { return (!(n>1))? 1 : /* what goes here? */ (n-1)*n; … Read more
I think a little history lesson is due. JavaScript was originally named Mocha and changed to Livescript but ultimately became JavaScript. It’s important to note that JavaScript came before ECMAscript and the history will tell you why. To start from the beginning, JavaScript derived its name from Java and initially Brendan Eich (the creator of … Read more