{"id":10399,"date":"2023-06-14T21:19:00","date_gmt":"2023-06-14T21:19:00","guid":{"rendered":"https:\/\/basescripts.com\/?p=10399"},"modified":"2023-06-14T21:19:07","modified_gmt":"2023-06-14T21:19:07","slug":"top-5-javascript-interview-questions","status":"publish","type":"post","link":"https:\/\/basescripts.com\/top-5-javascript-interview-questions","title":{"rendered":"Top 5 JavaScript Interview Questions"},"content":{"rendered":"\n<ol class=\"wp-block-list\">\n<li><strong>What are the different data types present in JavaScript?<\/strong><\/li>\n<\/ol>\n\n\n\n<p>JavaScript has 7 primitive data types:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Numbers<\/strong>&nbsp;are used to represent numbers.<\/li>\n\n\n\n<li><strong>Strings<\/strong>&nbsp;are used to represent text.<\/li>\n\n\n\n<li><strong>Booleans<\/strong>&nbsp;are used to represent true or false values.<\/li>\n\n\n\n<li><strong>Null<\/strong>&nbsp;is used to represent a value that is not defined.<\/li>\n\n\n\n<li><strong>Undefined<\/strong>&nbsp;is used to represent a value that has not been defined.<\/li>\n\n\n\n<li><strong>Symbols<\/strong>&nbsp;are used to represent unique values.<\/li>\n\n\n\n<li><strong>BigInts<\/strong>&nbsp;are used to represent large numbers.<\/li>\n<\/ul>\n\n\n\n<p>In addition to primitive data types, JavaScript also has object and array data types.<\/p>\n\n\n\n<ol class=\"wp-block-list\" start=\"2\">\n<li><strong>Explain Hoisting in JavaScript.<\/strong><\/li>\n<\/ol>\n\n\n\n<p>Hoisting is a JavaScript feature that causes all variable declarations and function declarations to be moved to the top of their scope, even if they are not actually defined until later in the code. This can be a bit confusing, but it is important to understand how hoisting works in order to write correct JavaScript code.<\/p>\n\n\n\n<ol class=\"wp-block-list\" start=\"3\">\n<li><strong>Why do we use the word \u201cdebugger\u201d in JavaScript?<\/strong><\/li>\n<\/ol>\n\n\n\n<p>The word &#8220;debugger&#8221; is used in JavaScript to stop the execution of the code and enter the debugger. The debugger is a tool that allows you to step through your code line by line, inspect variables, and set breakpoints. This can be very helpful for debugging JavaScript code.<\/p>\n\n\n\n<ol class=\"wp-block-list\" start=\"4\">\n<li><strong>Difference between \u201c == \u201c and \u201c === \u201c operators.<\/strong><\/li>\n<\/ol>\n\n\n\n<p>The &#8221; == &#8221; operator is used for loose equality comparison, while the &#8221; === &#8221; operator is used for strict equality comparison. Loose equality comparison means that the two values being compared are only equal if they are of the same type and have the same value. Strict equality comparison means that the two values being compared must be of the same type and have the same value, and they must also be located in the same place in memory.<\/p>\n\n\n\n<ol class=\"wp-block-list\" start=\"5\">\n<li><strong>Difference between var and let keyword in javascript.<\/strong><\/li>\n<\/ol>\n\n\n\n<p>The <code>var<\/code> keyword is used to declare variables that are global or local to the current function. The <code>let<\/code> keyword is used to declare variables that are local to the current block of code. The main difference between <code>var<\/code> and <code>let<\/code> is that variables declared with <code>let<\/code> are block-scoped, while variables declared with <code>var<\/code> are function-scoped. This means that variables declared with <code>let<\/code> can only be accessed within the block in which they are declared, while variables declared with <code>var<\/code> can be accessed from anywhere within the function in which they are declared.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>JavaScript has 7 primitive data types: In addition to primitive data types, JavaScript also has object and array data types. Hoisting is a JavaScript feature that causes all variable declarations and function declarations to be moved to the top of their scope, even if they are not actually defined until later in the code. This &#8230; <a title=\"Top 5 JavaScript Interview Questions\" class=\"read-more\" href=\"https:\/\/basescripts.com\/top-5-javascript-interview-questions\" aria-label=\"Read more about Top 5 JavaScript Interview Questions\">Read more<\/a><\/p>\n","protected":false},"author":1,"featured_media":10300,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"advanced_seo_description":"","jetpack_seo_html_title":"","jetpack_seo_noindex":false,"jetpack_post_was_ever_published":false,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":false,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2}},"categories":[1],"tags":[],"class_list":["post-10399","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-javascript"],"jetpack_publicize_connections":[],"jetpack_featured_media_url":"https:\/\/i0.wp.com\/basescripts.com\/wp-content\/uploads\/2023\/06\/courses2.jpg?fit=512%2C512&ssl=1","jetpack-related-posts":[{"id":9855,"url":"https:\/\/basescripts.com\/10-javascript-code-interview-questions-with-code-example-and-detailed-explanations","url_meta":{"origin":10399,"position":0},"title":"10 JavaScript Code Interview questions with code example and detailed explanations","author":"Laurence Svekis","date":"April 28, 2023","format":false,"excerpt":"What is the difference between == and === in JavaScript? What is the difference between var, let, and const in JavaScript? What is the difference between an object and an array in JavaScript? What is the difference between a function declaration and a function expression in JavaScript? What is the\u2026","rel":"","context":"In &quot;JavaScript&quot;","block_context":{"text":"JavaScript","link":"https:\/\/basescripts.com\/category\/javascript"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/basescripts.com\/wp-content\/uploads\/2023\/04\/image-16.png?fit=1200%2C329&ssl=1&resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/basescripts.com\/wp-content\/uploads\/2023\/04\/image-16.png?fit=1200%2C329&ssl=1&resize=350%2C200 1x, https:\/\/i0.wp.com\/basescripts.com\/wp-content\/uploads\/2023\/04\/image-16.png?fit=1200%2C329&ssl=1&resize=525%2C300 1.5x, https:\/\/i0.wp.com\/basescripts.com\/wp-content\/uploads\/2023\/04\/image-16.png?fit=1200%2C329&ssl=1&resize=700%2C400 2x, https:\/\/i0.wp.com\/basescripts.com\/wp-content\/uploads\/2023\/04\/image-16.png?fit=1200%2C329&ssl=1&resize=1050%2C600 3x"},"classes":[]},{"id":10027,"url":"https:\/\/basescripts.com\/what-are-the-different-data-types-in-javascript","url_meta":{"origin":10399,"position":1},"title":"What are the different data types in JavaScript?","author":"Laurence Svekis","date":"May 8, 2023","format":false,"excerpt":"What are the different data types in JavaScript? JavaScript has several built-in data types that are used to represent different kinds of values. Here are the different data types in JavaScript: Number:\u00a0 Represents numeric values. It can be an integer or a floating-point number. For example: var age = 25;\u2026","rel":"","context":"In &quot;JavaScript&quot;","block_context":{"text":"JavaScript","link":"https:\/\/basescripts.com\/category\/javascript"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/basescripts.com\/wp-content\/uploads\/2023\/05\/image-23.png?fit=518%2C290&ssl=1&resize=350%2C200","width":350,"height":200},"classes":[]},{"id":14771,"url":"https:\/\/basescripts.com\/exploring-variables-and-data-types-in-javascript-a-guide-with-examples","url_meta":{"origin":10399,"position":2},"title":"Exploring Variables and Data Types in JavaScript A Guide with Examples","author":"Laurence Svekis","date":"March 18, 2024","format":false,"excerpt":"In the world of programming, understanding variables and data types is fundamental. Variables are the building blocks of any program, serving as containers for storing data values. JavaScript, with its dynamic nature, offers a variety of data types to meet the needs of different scenarios. This blog post delves into\u2026","rel":"","context":"In &quot;JavaScript&quot;","block_context":{"text":"JavaScript","link":"https:\/\/basescripts.com\/category\/javascript"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/basescripts.com\/wp-content\/uploads\/2024\/03\/image-51.png?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/basescripts.com\/wp-content\/uploads\/2024\/03\/image-51.png?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/basescripts.com\/wp-content\/uploads\/2024\/03\/image-51.png?resize=525%2C300&ssl=1 1.5x"},"classes":[]},{"id":10030,"url":"https:\/\/basescripts.com\/what-is-the-difference-between-null-and-undefined-in-javascript","url_meta":{"origin":10399,"position":3},"title":"What is the difference between null and undefined in JavaScript?","author":"Laurence Svekis","date":"May 8, 2023","format":false,"excerpt":"In JavaScript, null and undefined are both special values that represent the absence of a value. 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It is used to indicate the absence\u2026","rel":"","context":"In &quot;JavaScript&quot;","block_context":{"text":"JavaScript","link":"https:\/\/basescripts.com\/category\/javascript"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/basescripts.com\/wp-content\/uploads\/2023\/05\/image-24.png?fit=808%2C338&ssl=1&resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/basescripts.com\/wp-content\/uploads\/2023\/05\/image-24.png?fit=808%2C338&ssl=1&resize=350%2C200 1x, https:\/\/i0.wp.com\/basescripts.com\/wp-content\/uploads\/2023\/05\/image-24.png?fit=808%2C338&ssl=1&resize=525%2C300 1.5x, https:\/\/i0.wp.com\/basescripts.com\/wp-content\/uploads\/2023\/05\/image-24.png?fit=808%2C338&ssl=1&resize=700%2C400 2x"},"classes":[]},{"id":7842,"url":"https:\/\/basescripts.com\/learn-javascript-code-examples-coding-tips-free-pdf-guide","url_meta":{"origin":10399,"position":4},"title":"Learn JavaScript Code Examples Coding Tips Free PDF Guide","author":"Laurence Svekis","date":"February 11, 2023","format":false,"excerpt":"Learn JavaScript Code Examples Coding Tips Learn-JavaScript-Code-Examples-Coding-TipsDownload Basics of JavaScript Code JavaScript is a high-level, dynamic, and interpreted programming language. It is used to add interactivity and other dynamic elements to websites. The console in JavaScript\u00a0 The console in JavaScript is a tool used for debugging and testing purposes. It\u2026","rel":"","context":"In &quot;JavaScript&quot;","block_context":{"text":"JavaScript","link":"https:\/\/basescripts.com\/category\/javascript"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/basescripts.com\/wp-content\/uploads\/2023\/02\/jspealrn.jpg?fit=1200%2C675&ssl=1&resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/basescripts.com\/wp-content\/uploads\/2023\/02\/jspealrn.jpg?fit=1200%2C675&ssl=1&resize=350%2C200 1x, https:\/\/i0.wp.com\/basescripts.com\/wp-content\/uploads\/2023\/02\/jspealrn.jpg?fit=1200%2C675&ssl=1&resize=525%2C300 1.5x, https:\/\/i0.wp.com\/basescripts.com\/wp-content\/uploads\/2023\/02\/jspealrn.jpg?fit=1200%2C675&ssl=1&resize=700%2C400 2x, https:\/\/i0.wp.com\/basescripts.com\/wp-content\/uploads\/2023\/02\/jspealrn.jpg?fit=1200%2C675&ssl=1&resize=1050%2C600 3x"},"classes":[]},{"id":14548,"url":"https:\/\/basescripts.com\/javascript-variables-and-data-types","url_meta":{"origin":10399,"position":5},"title":"JavaScript variables and data types","author":"Laurence Svekis","date":"March 6, 2024","format":false,"excerpt":"Exercise 1: Declaring Variables Problem: Create three variables: a string named city, a number named population, and a boolean named isCapital. Assign appropriate values to them. Explanation: This exercise helps understand the basic syntax for variable declaration in JavaScript using let or const. 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