JavaScript Built in Functions

JavaScript has a rich set of built-in functions, also known as methods or functions, that perform common operations and calculations. Here are some of the most commonly used ones:

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1. console.log() – prints a message to the console.
2. alert() – displays a message in a dialog box.
3. prompt() – displays a dialog box that prompts the user for input.
4. confirm() – displays a dialog box that prompts the user to confirm an action.
5. typeof() – returns the data type of a variable.
6. parseInt() – converts a string to an integer.
7. parseFloat() – converts a string to a floating-point number.
8. isNaN() – checks whether a value is not a number.
9. String() – converts a value to a string.
10. Array() – creates a new array.
11. push() – adds an element to the end of an array.
12. pop() – removes the last element from an array.
13. shift() – removes the first element from an array.
14. unshift() – adds an element to the beginning of an array.
15. slice() – returns a portion of an array.
16. indexOf() – returns the index of the first occurrence of a value in an array.
17. lastIndexOf() – returns the index of the last occurrence of a value in an array.
18. join() – joins all elements of an array into a string.
19. sort() – sorts the elements of an array.
20. reverse() – reverses the order of elements in an array.

These are just a few examples of the many built-in functions available in JavaScript. The full list can be found in the official documentation.