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Asked: 2026-05-31T05:22:10+00:00

I have a question regarding why the following returns inconsistent values (function(ab, $, undefined

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I have a question regarding why the following returns inconsistent values

(function(ab, $, undefined ) {

    ​ab.cool = {
        nice: {
            funky: {
                sweet: false
            }    
        }
    };

    var reVal = ab.cool.nice.funky.sweet;
    reVal = true;

    console.log(reVal); //equals true
    console.log(ab.cool.nice.funky.sweet); //equals false

}( window.ab = window.ab || {}, jQuery ));​

I would have thought that both SHOULD return the same value true ?

Can someone please explain why this occurs ? Are they considered different properties ?

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1 Answer

  1. Editorial Team

    What’s happening is that the value of ab.cool.nice.funky.sweet gets copied to reVal. This would not happen if you tried to copy ab.cool.nice.funky to reVal, since both symbols would then reference the same object.

    This differentiation is the product of treating value types, such as booleans or integers, differently than reference types which in javascript basically means objects.

    Check this for more info: http://docstore.mik.ua/orelly/webprog/jscript/ch11_02.htm

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