how to do trim in javascript code example

Example 1: javascript trim

var str=" I have outer spaces ";
var cleanStr=str.trim();//trim() returns string with outer spaces removed

Example 2: js trim()

var str = '   foo  ';
console.log(str.trim()); // retorna 'foo'

// Outro exemplo de .trim() removendo whitespace de
// apenas um lado.

var str= 'foo    ';
console.log(str.trim()); // retorna 'foo'