var b = true;
b.foo = 'whatever'; // Auto-boxing occurs?
b.foo; // undefined - why?
Can I retrieve the value of property foo now?
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var b has to be an object, `e.g var b = {}; b.foo='whatever'; b.foo = 'whatever'Babajide Fowotade– Babajide Fowotade2015-08-27 12:54:57 +00:00Commented Aug 27, 2015 at 12:54
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No, Might be because it's a primitive type ..Hacketo– Hacketo2015-08-27 12:56:40 +00:00Commented Aug 27, 2015 at 12:56
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possible duplicate of What is the difference between JavaScript object and primitive types?Hacketo– Hacketo2015-08-27 12:58:58 +00:00Commented Aug 27, 2015 at 12:58
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related too : stackoverflow.com/questions/5201138/…Hacketo– Hacketo2015-08-27 12:59:38 +00:00Commented Aug 27, 2015 at 12:59
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1 Answer
var b is initially set to Boolean value. to assign dot notation to a variable, it has to be a javascript Object.
if b is set as var b = {}, b.foo = 'whatever'; should work.
For better practice always check type of variable before switching its datatype:
var b = true;
if(typeof b === 'object'){
b.foo = 'whatever';
}
