How do you create an Immediately Invoked Function Expression (IIFE)?
A). (function() { alert('IIFE'); })();
B). function() { alert('IIFE'); }();
C). (function { alert('IIFE'); })();
D). function() { alert('IIFE'); };
What will be the output of the following code? var multiply = (x, y) => x * y; console.log(multiply(3, 4));
A). 12
B). 34
C). multiply
D). undefined
How can you store a function as a property of an object?
A). var obj = { method: function() { alert('Hello'); } };
B). var obj = { method: alert('Hello'); };
C). var obj = { method: function { alert('Hello'); } };
D). var obj = { function() { alert('Hello'); } };
How can you invoke a function stored in a variable doSomething?
A). doSomething();
B). call doSomething;
C). doSomething[];
D). invoke(doSomething);
What will be the output of the following code? var counter = (function() { var count = 0; return function() { return ++count; }; })(); console.log(counter()); console.log(counter());
A). 1, 2
B). 0, 1
C). undefined, undefined
D). 2, 4
What will be the output of the following code? var add = new Function('a', 'b', 'return a + b'); console.log(add(2, 3));
A). 5
B). add
C). undefined
D). 2 3
Which of the following is true about functions in JavaScript?
A). Functions can be assigned to variables
B). Functions can be passed as arguments to other functions
C). Functions can be returned from other functions
D). All of the above
Which of the following is an example of using a function as a return value?
A). function outer() { return function() { alert('Inner'); }; }
B). function outer() { function() { alert('Inner'); }; return; }
C). function outer() { function() { alert('Inner'); }; }
D). function outer() { return function { alert('Inner'); }; }
How do you assign a function to a variable in JavaScript?
A). var greet = function() { alert('Hello'); };
B). var greet = function { alert('Hello'); };
C). function greet() { alert('Hello'); }
D). var greet = function alert('Hello');
What is the output of the following code? function makeAdder(a) { return function(b) { return a + b; }; } var add5 = makeAdder(5); console.log(add5(2));
A). 7
B). 5
C). add5
D). makeAdder