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JavaScript Interview Questions

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a screenshot of a computer screen with the text var vs letv's const

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Do you know what are the differences between declaring a variable with var, let, and const in JavaScript? #javascript #interview #webtips #50JSQuestions 📖 Learn more at https://www.webtips.dev/webtips/javascript-interview/what-are-the-differences-between-var-let-and-const
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Short-circuiting is a great way to simplify your code and make it more concise #javascript #interview #webtips #50JSQuestions 📖 Learn more at https://www.webtips.dev/webtips/javascript-interview/what-are-short-circuits
an image of what is the output for a program? with text overlaying it

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Do you know what will be the output of the following code example? #javascript #interview #webtips #50JSQuestions 📖 Learn more at https://www.webtips.dev/webtips/javascript-interview/settimeout-in-a-for-loop
a screenshot of a computer screen with the text how to check check for palindromes?

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One common quick coding challenge you can come across is about checking if a word is a palindrome. Do you know how this can be achieved in JavaScript? #javascript #interview #webtips #50JSQuestions 📖 Learn more at https://www.webtips.dev/webtips/javascript-interview/how-to-check-for-palindromes-in-javascript
what is the event loop? with qr - code and qr - code

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Do you know how the event loop works in JavaScript and what is its purpose? #javascript #interview #webtips #50JSQuestions 📖 Learn more at https://www.webtips.dev/webtips/javascript-interview/what-is-the-event-loop
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The reason behind getting the famous "undefined is not a function" error #javascript #interview #webtips #50JSQuestions 📖 Learn more at https://www.webtips.dev/webtips/javascript-interview/undefined-is-not-a-function-in-javascript
a screenshot of a computer screen with the text, what is triple equal?

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Javascript uses two different equal signs for equality comparisons. You have abstract and strict equality comparison. Do you know the difference between the two? #javascript #interview #webtips #50JSQuestions 📖 Learn more at https://www.webtips.dev/webtips/javascript-interview/what-is-triple-equal-in-javascript
a screenshot of a computer screen with the text what are bilwise operators?

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Bitwise operators are rarely used in code and there's a good reason for it. It's nice to know about them, but be careful where you introduce logic using bitwise operators. #javascript #interview #webtips #50JSQuestions 📖 Learn more at https://www.webtips.dev/webtips/javascript-interview/what-are-bitwise-operators
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Do you know what will be the output of the below code example? #javascript #interview #webtips #50JSQuestions 📖 Learn more at https://www.webtips.dev/webtips/javascript-interview/what-is-the-output-of-the-this-code
a screenshot of a computer screen with the text list some ess features on it

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JavaScript tip: some useful ES9 features that are good to know about #javascript #interview #webtips #50JSQuestions 📖 Learn more at https://www.webtips.dev/webtips/javascript-interview/what-are-some-es9-features
a screenshot of a computer screen with the text, what is triple equal?

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How come JavaScript is single-threaded, but asynchronous at the same time? A great visualization of this can be found on http://latentflip.com/loupe #javascript #interview #webtips #50JSQuestions 📖 Learn more at https://www.webtips.dev/webtips/javascript-interview/how-is-javascript-single-threaded-and-asynchronous
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Do you know what is the difference between null and undefined in JavaScript? #javascript #interview #webtips #50JSQuestions 📖 Learn more at https://www.webtips.dev/webtips/javascript-interview/the-difference-between-null-and-undefined-in-javascript
Did you know that parseInt can take up a second parameter which is responsible for the radix? #javascript #interview #webtips #50JSQuestions 📖 Learn more at https://www.webtips.dev/webtips/javascript-interview/what-is-the-purpose-of-the-second-param-in-parseint Javascript Class Inheritance, Javascript Scope Chain Tutorial, Javascript Promise Code, Prototype Chain In Javascript, Javascript Scope Chain, How To Use Javascript Prototypes, Javascript Prototype Diagram, Javascript Prototype Inheritance Explained, Javascript Scope Chain Explanation

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Did you know that parseInt can take up a second parameter which is responsible for the radix? #javascript #interview #webtips #50JSQuestions 📖 Learn more at https://www.webtips.dev/webtips/javascript-interview/what-is-the-purpose-of-the-second-param-in-parseint
a screenshot of a screen with the text how to check if something is an array?

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Do you know what is difference between i++ and ++i, called post and prefix increments? #javascript #interview #webtips #50JSQuestions 📖 Learn more at https://www.webtips.dev/webtips/javascript-interview/the-difference-between-postfix-and-prefix-increment
Do you know what are design patterns? They are not specifically tied to JavaScript, but it's still important to know about them #javascript #interview #webtips #50JSQuestions 📖 Learn more at https://www.webtips.dev/webtips/javascript-interview/what-are-design-patterns Javascript Class Inheritance, Javascript Scope Chain Tutorial, Javascript Promise Code, Prototype Chain In Javascript, Javascript Scope Chain, How To Use Javascript Prototypes, Javascript Prototype Diagram, Javascript Prototype Inheritance Explained, Javascript Scope Chain Explanation

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Do you know what are design patterns? They are not specifically tied to JavaScript, but it's still important to know about them #javascript #interview #webtips #50JSQuestions 📖 Learn more at https://www.webtips.dev/webtips/javascript-interview/what-are-design-patterns