JAVASCRIPT QUICK GUIDE: A Step-by-Step Guide to JavaScript for Beginners by JACKSON KEVIN
Author:JACKSON, KEVIN
Language: eng
Format: epub
Publisher: UNKNOWN
Published: 2023-12-05T00:00:00+00:00
Quiz:
â1. âWhat is the purpose of a variable in JavaScript?
ââ âA. To perform mathematical operations
ââ âB. To store and manage data
ââ âC. To create loops
ââ âD. To define HTML elements
â2. âWhich keyword is used for declaring a constant variable in JavaScript?
ââ âA. let
ââ âB. const
ââ âC. var
ââ âD. constant
â3. âWhat does the === operator do in JavaScript?
ââ âA. Compares values for equality without type conversion
ââ âB. Performs assignment
ââ âC. Compares values for equality with type conversion
ââ âD. Checks if a variable is undefined
â4. âWhich of the following is a correct way to declare an array in JavaScript?
ââ âA. let fruits = { "apple", "banana", "orange" };
ââ âB. let fruits = ["apple", "banana", "orange"];
ââ âC. let fruits = "apple", "banana", "orange";
ââ âD. array fruits = ["apple", "banana", "orange"];
â5. âWhat does the for loop in JavaScript primarily do?
ââ âA. Repeats a block of code while a condition is true
ââ âB. Executes a block of code a specific number of times
ââ âC. Executes code when a specific event occurs
ââ âD. Iterates over the properties of an object
â6. âWhich JavaScript operator is used for combining multiple conditions in an if statement?
ââ âA. || (logical OR)
ââ âB. && (logical AND)
ââ âC. ! (logical NOT)
ââ âD. == (equality)
â7. âWhat is the purpose of a JavaScript function?
ââ âA. To declare variables
ââ âB. To perform mathematical operations
ââ âC. To store data in arrays
ââ âD. To encapsulate and reuse a block of code
â8. âHow do you access an element in an array by its index in JavaScript?
ââ âA. array.getElement(2);
ââ âB. array.item(2);
ââ âC. array[2];
ââ âD. array.access(2);
â9. âWhich JavaScript data type is used for true/false values?
ââ âA. String
ââ âB. Number
ââ âC. Boolean
ââ âD. Array
â10. âWhat is the purpose of comments in JavaScript?
ââ âA. To execute code
ââ âB. To define variables
ââ âC. To provide explanations and make code more readable
ââ âD. To create loops
Answers:
â1. âB
â2. âB
â3. âA
â4. âB
â5. âB
â6. âB
â7. âD
â8. âC
â9. âC
â10. âC
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