For these reasons, code may break when it encounters String objects when it expects a primitive string instead,
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String - JavaScript | MDNar 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"
<span>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.
A String object can always be converted to its primitive counterpart with the valueOf() method.
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