Name some of the built-in methods and the values returned by them

JavaScript provides a variety of built-in methods that can be used on different data types. Here are some commonly used built-in methods along with brief descriptions of the values they return:

String Methods:
  1. length:
    • Returns the number of characters in a string.

                        let str = "Hello, World!";
                        console.log(str.length); // Output: 13                    

  2. toUpperCase():
    • Returns a new string with all characters converted to uppercase.

                        let str = "hello";
                        console.log(str.toUpperCase()); // Output: "HELLO"                    

  3. toLowerCase():
    • Returns a new string with all characters converted to lowercase.

                        let str = "HELLO";
                        console.log(str.toLowerCase()); // Output: "hello"                 

  4. substring(start, end):
    • Returns a substring of the original string based on the specified start and end indices.

                        let str = "Hello, World!";
                        console.log(str.substring(0, 5)); // Output: "Hello"                    

Array Methods:
  1. length:
    • Returns the number of elements in an array.

                        let arr = [1, 2, 3, 4, 5];
                        console.log(arr.length); // Output: 5                    

  2. push(element):
    • Adds an element to the end of an array and returns the new length of the array.

                        let arr = [1, 2, 3];
                        console.log(arr.push(4)); // Output: 4 (new length)                    

  3. pop():
    • Removes the last element from an array and returns that element.

                        let arr = [1, 2, 3, 4];
                        console.log(arr.pop()); // Output: 4 (removed element)                    

  4. join(separator):
    • Joins all elements of an array into a string, separated by the specified separator.

                        let arr = ["apple", "orange", "banana"];
                        console.log(arr.join(", ")); // Output: "apple, orange, banana"                    

  5. indexOf(element):
    • Returns the index of the first occurrence of an element in an array. Returns -1 if the element is not found.

                        let arr = [10, 20, 30, 40, 50];
                        console.log(arr.indexOf(30)); // Output: 2                    

These are just a few examples, and JavaScript provides many more built-in methods for various data types. The returned values depend on the specific method used.

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