Functions Used as Variable Values Mockest | JavaScript

1.

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");

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2.

What will be the output of the following code? var sayHi = function() { return "Hi"; }; console.log(sayHi());

A). Hi B). undefined C). sayHi D). function

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3.

How can you pass a function as an argument to another function?

A). performAction(function() { alert("Action!"); }); B). performAction(function { alert("Action!"); }); C). performAction(function() alert("Action!");); D). performAction(function() alert("Action!"))

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4.

What is the term for a function that is passed as an argument to another function?

A). Callback function B). Nested function C). Helper function D). Inner function

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5.

What will be the output of the following code? var double = function(x) { return x * 2; }; console.log(double(5));

A). 10 B). 5 C). undefined D). double

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6.

How do you define an anonymous function assigned to a variable?

A). var anon = function() { alert("Anonymous!"); }; B). var anon = function { alert("Anonymous!"); }; C). function anon() { alert("Anonymous!"); } D). var anon = function anonymous() { alert("Anonymous!"); };

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7.

Which of the following correctly demonstrates a function returning another function?

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"); }; }

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8.

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

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9.

How can you invoke a function stored in a variable doSomething?

A). doSomething(); B). call doSomething; C). doSomething[]; D). invoke(doSomething);

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10.

Which of the following is an example of an arrow function assigned to a variable?

A). var add = (a, b) => { return a + b; }; B). var add = (a, b) => return a + b; C). var add = (a, b) => { a + b }; D). var add = (a, b) { return a + b; };

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Functions Used as Variable Values Mocktest

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