Javascript: remove trailing spaces only

Update 2019

String trim methods have been added to ECMAScript spec in 2019 with wide browser support

• String.trim()
• String.trimStart()
• String.trimEnd()

You can use like this:

" test ".trimEnd() // " test"

Further Reading

• tc39 proposal - String.prototype.{trimStart,trimEnd}

"    test    ".replace(/\s+$/g, '');

Use String#replace with regex /\s+$/ and replacing text as empty string.

string.replace(/\s+$/, '')

console.log(
  '-----' + '    test    '.replace(/\s+$/, '') + '-----'
)