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JavaScript has many built-in methods that provide useful functionality for working with data, strings, arrays, dates, and more. Here are some important built-in methods in JavaScript:
alert()- displays a message in a dialog box.console.log()- writes a message to the browser console.parseInt()- converts a string to an integer.parseFloat()- converts a string to a floating-point number.toString()- converts a value to a string.toUpperCase()- converts a string to uppercase.toLowerCase()- converts a string to lowercase.concat()- concatenates two or more strings.indexOf()- returns the index of the first occurrence of a specified value in a string or array.lastIndexOf()- returns the index of the last occurrence of a specified value in a string or array.slice()- extracts a section of a string or array and returns it as a new string or array.splice()- adds or removes elements from an array.sort()- sorts the elements of an array.reverse()- reverses the order of the elements in an array.join()- joins all elements of an array into a string.push()- adds an element to the end of an array.pop()- removes the last element of an array.shift()- removes the first element of an array.unshift()- adds an element to the beginning of an array.toString()- converts an array to a string.