How can you invoke a function named init only once when the script runs?

What is the main purpose of the () operator in JavaScript functions?

A). To define a function

B). To invoke a function

C). To declare a variable

D). To create an object

What is the output of function sayHi() { return 'Hi'; } alert(sayHi());?

A). sayHi

B). Hi

C). undefined

D). alert

What happens if a function is invoked without parentheses in an event handler like onclick='myFunction'?

A). The function is executed immediately

B). The function reference is assigned

C). An error is thrown

D). The function does not work

What is the output of function sum(a, b) { return a + b; } console.log(sum(3, 4));?

A). 34

B). 7

C). undefined

D). sum

Which of the following correctly invokes a function with parameters?

A). function myFunc(a, b) { }; myFunc(a b);

B). function myFunc(a, b) { }; myFunc(a, b);

C). function myFunc(a b) { }; myFunc(a, b);

D). function myFunc(a, b) { }; myFunc[];

What does return do inside a function?

A). Stops the function

B). Returns a value to the caller

C). Both A and B

D). Declares a variable

Which of these is the correct way to define and immediately invoke a function?

A). function() { return 1; };

B). (function() { return 1; })();

C). function() { return 1; }();

D). function {}()

How can you invoke a function using the call method?

A). myFunction.call();

B). myFunction.call(this);

C). call.myFunction();

D). call(myFunction);

What is the output of var test = function() { return 5; }; console.log(test());?

A). test

B). 5

C). undefined

D). function

What will function greet() { console.log('Hi'); } var x = greet; x(); output?

A). Hi

B). undefined

C). x

D). greet