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

Which are not valid HTML events?

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

Which is not a valid JavaScript operator?

Which is an invalid function declaration?

Which is used to solve the problem of enumerations in JavaScript?

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

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

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?

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

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