You may trim a string at both ends, or only at one, by using .trim(...), .trimStart(...), and .trimEnd(...):
" Hello, there! ".trim(); // "Hello, there!"
" Hello, there! ".trimStart(); // "Hello, there! "
" Hello, there! ".trimEnd(); // " Hello, there!"
Originally, .trimStart() was .trimLeft(), and .trimEnd() was .trimRight(), but the names were changed for the same reason as .padStart() and .padEnd() were.