FREE AND STUDY GAMES ABOUT JAVASCRIPT VOCAB

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FREE AND STUDY GAMES ABOUT JAVASCRIPT VOCAB

EXAM QUESTIONS

Actual Qs and Ans Expert-Verified Explanation

This Exam contains:

-Guarantee passing score -42 Questions and Answers -format set of multiple-choice -Expert-Verified Explanation

Question 1: Boolean

Answer:

______ are a primitive data type. They can be either true or false.

Question 2: Math.floor()

Answer:

This function returns the largest integer less than or equal to the given number.

console.log(Math.floor(5.95));

// Prints: 5

Question 3: Numbers

Answer:

_______ are a primitive data type. They include the set of all integers and floating point numbers.

let amount = 6; let price = 4.99;

Question 4: Null

Answer:

is a primitive data type. It represents the intentional absence of value.

let x = null;

Question 5: If Else

Answer:

If condition is truthy = executes. If falsy, another state can be executed.

function testNum(a) { let result; if (a > 0) { result = 'positive'; } else { result = 'NOT positive'; } return result; }

console.log(testNum(-5));

Question 6: Return

Answer:

Specifies the value to be returned by a function.

Question 7: Function Expression

Answer:

The function keyword can be used to define a function inside an expression.

const getRectArea = function(width, height) { return width * height; };

console.log(getRectArea(3, 4));

// expected output: 12

Question 8: Method .pop()

Answer:

This method removes the last element from an array and returns that element.

const ingredients = ['eggs', 'flour', 'chocolate'];

const poppedIngredient = ingredients.pop(); // 'chocolate' console.log(ingredients); // ['eggs', 'flour']

Question 9: Method .push()

Answer:

Adding one or more elements to the end of an array.

// Adding multiple elements:

const numbers = [1, 2]; numbers.push(3, 4, 5);

console.log(numbers)

// [1, 2, 3, 4, 5 ]

Question 10: Function Declaration

Answer:

This (function statement) defines a function with the specified parameters.

function calcRectArea(width, height) { return width * height; }

console.log(calcRectArea(5, 6));

// expected output: 30

Question 11: Relational Operators

Answer:

in instanceof < > <= >=

Question 12: Const

Answer:

______ are block-scoped, much like variables defined using the let keyword. The value of a constant can't be changed through reassignment, and it can't be redeclared.

Question 13: String Concatenation

Answer:

Multiple strings can be put together using the + operator.

let service = 'credit card'; let month = 'May 30th'; let displayText = 'Your ' + service + ' bill is due on ' + month + '.';

Question 14: Mutable

Answer:

JavaScript arrays are _____ meaning that the values they contain can be changed.

Question 15: Object

Answer:

This class represents one of JavaScript's data types. It is used to store various keyed collections and more complex entities.

Question 16: Class

Answer:

Declares a class.

Question 17: string.length

Answer:

The .length property of a string returns the number of characters that make up the string.

Question 18: Arithmetic Operators

Answer:

• addition
• subtraction
• multiplication

/ division % modulo ** exponents