JavaScript String Reference

Learn how to use JavaScript template literals (backticks) for string manipulation, including multiline strings, variable interpolation, expressions, and dynamic URL creation with practical examples.

The trim() function removes whitespace from both ends of a given string and returns a new string without modifying the original string.

The toLowerCase() function returns the given string converted to lowercase. Since it only returns the converted string, the original string remains unchanged.

The toUpperCase() function returns the given string converted to uppercase. Since it only returns the converted string, the original string remains unchanged.

The includes() function for strings checks whether a given string contains a specified substring and returns true if it does, or false otherwise.

The indexOf() function for strings returns the index of the first occurrence of the specified substring. If the specified substring is not found, it returns -1.

The search() function for strings searches for a match between a regular expression and a string, returning the index (integer) of the first match.

The replace() function for strings returns a new string where one or more occurrences of a specific substring or a regular expression pattern are replaced by a specified replacement.

The slice() function for strings slices a string by an index range and returns a new string without modifying the original string.

The split() function splits a given string based on a specified delimiter or a regular expression and returns a new array.

The substring() function extracts a specific portion of a string. It returns a new string from the specified start index up to, but not including, the end index.

The match() function for strings uses a regular expression to find parts of a given string that match and returns the result.