# javascript assign vs jquery extend

extend는 객체를 merge할 때도 사용하고, 복사를 사용할 때도 사용합니다. 

(주로 복사를 할 때 사용합니다.)

{% embed url="<https://gomakethings.com/vanilla-javascript-version-of-jquery-extend/>" %}

{% embed url="<https://www.pixelstech.net/article/1477888746-Deep-clone-of-JavaScript-object>" %}

객체를 merge 할 때 jquery에서는 extend를 사용하고 javascript에서는 assign을 한다고 한다.&#x20;

그리고 객체의 복사에는 shallow copy, deep copy가 있는데

shallow copy는 객체의 레퍼런스만 복사를 하고,

deep copy는 객체의 레퍼런스, 컨텐츠들을 복사를 합니다.&#x20;

jquery의 extend는 shallow copy를 하고

javascript의 assign은 deep copy를 합니다.&#x20;


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