- Synchronous operations in JavaScript entails having each step of an operation waits for the previous step to execute completely.
- This means no matter how long a previous process takes, subsequent process won't kick off until the former is completed.
Asynchronous :
- Asynchronous operations, on the other hand, defers operations.
- Any process that takes a lot of time to process is usually run alongside other synchronous operation and completes in the future.
✨ Callback Function :
- When function simply accepts another function as an argument, this contained function is known as callback function.
- Using callback functions is a core functional programming concept, and you can find them in most JavaScript code; like setInterval
✅ Example - setInterval accepts a callback function as its first parameter and also a time interval. Another example using .map();
✅ In the example above, we used the .map() method to iterate through the array list, the method accepts a callback function which states how each element of the array will be manipulated.
✅Callback functions can also accept arguments as well.
- Callback functions can be named or anonymous functions.
✨ The Given function is assigned a name greeting and has an argument of name. We're also using an ES6 template string. Let’s use this function as a callback function.
- Notice the usage of the callback? The succeeding brackets, () after the function are not used when passing the function as a parameter.
✨Note: The callback function is not run unless called by its containing function, it is called back. Hence, the term call back function
✨Multiple functions can be created independently and used as callback functions.
⚡️These create multi-level functions. When this function tree created becomes too large, the code becomes incomprehensible sometimes and is not easily refactored. This is known as CALLBACK HELL.
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JavaScript is a text-based programming language used both on the client-side and server-side that allows you to make web pages interactive. The general-purpose core of the language has been embedded in Netscape and other web browsers.
Q2. Is JavaScript a case-sensitive language?
Yes, JavaScript is a case sensitive language. The language keywords, variables, function names, and any other identifiers must always be typed with a consistent capitalization of letters.
According to stackoverflow’s survey 2020, JavaScript is the most commonly used language for the 8th year straight with 67.7% people opting for it. The major reason for its popularity is the fact that its versatile & can be used for both frontend & backend as well as for testing.
8. JavaScript drawing 9. Reminder app 10. Google home page Clone 11. Tribute page 12. Survey form 13. Exit plugin 14. Weather app
15. Social share buttons 16. Toast notifications 17. AJAX-style login 18. Word counter 19. Countdown timer 20. Modal pop-ups 21. Address book 22. The Movies Dashboard 23. Tic Tac Toe Game 24. E- commerce Site 25. Color picker jumbtron