Js Built-in Functions

Method	Description
charAt()	Returns the character at the specified index.
concat()	Combines the text of two strings and returns a new string.
forEach()	Calls a function for each element in the array.
indexOf()	Returns the index within the calling String object of the first occurrence of the specified value, or -1 if not found.
length()	Returns the length of the string.
pop()	Removes the last element from an array and returns that element.
push()	Adds one or more elements to the end of an array and returns the new length of the array.
reverse()	Reverses the order of the elements of an array -- the first becomes the last, and the last becomes the first.
sort()	Sorts the elements of an array.
substr()	Returns the characters in a string beginning at the specified location through the specified number of characters.
toLowerCase()	Returns the calling string value converted to lower case.
toString()	Returns the string representation of the number's value.
toUpperCase()	Returns the calling string value converted to uppercase.