In relation to sealing an object globally, which of the following methods returns true if adding, removing, and changing properties is forbidden and all the current properties are configurable: false, writable: false?

Using DATE object which call a function based on elapsed time?

var a = [2, 5, 12, 16, 23, 35]; XXXX function abc( YYYY ) { return val > 20; } Which option will replace XXXX and YYYY in order to generate 4 as an output?

What's the output? var str = /u/.exec('I am the best friend!'); console.log(str);

What's the output? var test = function test(){ console.log('2' - - '2'); }; test();

Which are invalid usage(s) for a web worker in JavaScript? 1. Making use of the window shortcut to get the current global scope in a web worker. 2. Trying to access data in DOM directly with a web worker.

Which is an invalid function declaration?

Which is not a valid JavaScript operator?

Best reason for not using 'for...in' with array iteration?

Which are not valid HTML events?

The following functions are for encoding URL parameters in Javascript. Which function escape converts non-ASCII characters into its Unicode escape sequences, like %uxxx?