JavaScript String Methods

📄️ concat()

concat() creates a new string by concatenating its calling string and its arguments.

includes() checks if its calling string includes the method's first argument.

indexOf() searches its calling string for the first occurrence of the method's string argument.

lastIndexOf() searches its calling string for the last occurrence of the method's argument.

JavaScript's match() method creates a new array containing all the patterns that match the method's regular expression argument.

matchAll() creates a new iterator object containing all the patterns—including capturing groups—that match the method's regular expression argument.

replace() returns a new version of its calling string after replacing some specified patterns with a given replacement.

search() searches its calling string for the first occurrence of the method's regular expression argument.

JavaScript's slice() method duplicates a specified part of its calling string into a new string—without altering the original string.

split() returns an array containing the result of splitting a string into substrings.

toLowerCase() returns the lowercase version of its calling string.

toUpperCase() returns the uppercase version of its calling string.

The JavaScript trim() method trims whitespace from both ends of a string.

The JavaScript trimEnd() method trims whitespace only at the end of a string.

The JavaScript trimStart() method trims whitespace only at the beginning of a string.