function foo() { this = "foo"; } var a = foo(); What will the preceding code produce?

Values of x and y after the invocation of `foo` in following? var x = 'I am global x'; var y = 'I am global y'; function foo() { var y = x = 'Hello from foo'; } foo();

What will this code produce: +new Date()

What is the value of x? var a = 'abc'; var x = a instanceof String;

Math.log(x) returns:

Which will create a copy of an array such that changes to the old array will not be reflected in the new array?

What is JavaScript?

What will be the value of a? let a = void function f() { let a = 1 - 2; let b = 2 - 3 + 1; if (a) { return true; } else if (b) { return false; } else { return null; } return -1; }();

Which statement about Promises is not correct?

What's the point of code around the variable statement: (function() { var a = true; })();

How often will message 'hey' be logged in console? setInterval(() => {console.log('hey')},1);