String.prototype.trim

An extension for the JavaScript class String, which removes leading and trailing spaces from a string

String.prototype.trim = function() {
   return this.replace(/^\s+|\s+$/g, '');
};

Usage

<script>
    document.write('--');
    document.write(' Hello World '.trim());
    document.write('--');
</script>

Result

without trim()
-- Hello World --

with trim() 
--Hello World--
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