Difference between == vs === should be used in JavaScript?

 Javascript have two types of options for

•  ==   and   !=
• === and !==
• === results as true
• !== results as false
• '' == '0'           // false
• 0 == ''             // true
• 0 == '0'            // true
• false == 'false'    // false
• false == '0'        // true
• false == undefined  // false
• false == null       // false
• null == undefined   // true
• ' \t\r\n ' == 0     // true
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