#javascript #object #string #syntax
In contexts where a method is to be invoked on a primitive string or a property lookup occurs, JavaScript will automatically wrap 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"
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String - JavaScript | MDNg calls in a non-constructor context (i.e., without using the new keyword) are primitive strings. JavaScript automatically converts primitives to String objects, so that it's possible to use String object methods for primitive strings. <span>In contexts where a method is to be invoked on a primitive string or a property lookup occurs, JavaScript will automatically wrap 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"
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 ot Summary
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