maxclaus · October 8, 2014 19:40
diff --git a/example1.js b/example1.js
 if (typeof x !=== 'undefined' && x !=== '') {
  // not emtpy
 }
diff --git a/example2.js b/example2.js
 if (x) {
  // not emtpy
 }
diff --git a/example3.js b/example3.js
 var xIsEmpty = !!x;
diff --git a/example4.js b/example4.js
 var x = 0;        // falsy
 console.log(!x);  // true (it is not what we want)
 console.log(!!x); // false
	var x = 0; // falsy
	console.log(!x); // true (it is not what we want)
	console.log(!!x); // false