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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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console.log()
– prints a message to the console.alert()
– displays a message in a dialog box.prompt()
– displays a dialog box that prompts the user for input.confirm()
– displays a dialog box that prompts the user to confirm an action.typeof()
– returns the data type of a variable.parseInt()
– converts a string to an integer.parseFloat()
– converts a string to a floating-point number.isNaN()
– checks whether a value is not a number.String()
– converts a value to a string.Array()
– creates a new array.push()
– adds an element to the end of an array.pop()
– removes the last element from an array.shift()
– removes the first element from an array.unshift()
– adds an element to the beginning of an array.slice()
– returns a portion of an array.indexOf()
– returns the index of the first occurrence of a value in an array.lastIndexOf()
– returns the index of the last occurrence of a value in an array.join()
– joins all elements of an array into a string.sort()
– sorts the elements of an array.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.