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String primitives and String objects also give different results when using eval(). Primitives passed to eval are treated as source code; String objects are treated as all other objects are, by returning the object. For example:

 var s1 = '2 + 2' ; // creates a string primitive var s2 = new String ( '2 + 2' ) ; // creates a String object console . log ( eval ( s1 ) ) ; // returns the number 4 console . log ( eval ( s2 ) ) ; // returns the string "2 + 2"
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String - JavaScript | MDN
the string primitive and call the method or perform the property lookup. var s_prim = 'foo'; var s_obj = new String(s_prim); console.log(typeof s_prim); // Logs "string" console.log(typeof s_obj); // Logs "object" <span>String primitives and String objects also give different results when using eval() . Primitives passed to eval are treated as source code; String objects are treated as all other objects are, by returning the object. For example: var s1 = '2 + 2'; // creates a string primitive var s2 = new String('2 + 2'); // creates a String object console.log(eval(s1)); // returns the number 4 console.log(eval(s2)); // returns the string "2 + 2" For these reasons, code may break when it encounters String objects when it expects a primitive string instead, although generally authors need not worry about the distinction.


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