When an object instance is passed to a function argument,

Question

When an object instance is passed to a function argument,

does it duplicate it for the function to use or it makes reference back to the actual variable value?

Looking at it from memory and performance perspective

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26.03.2022

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Thomas · Accepted Answer

Thomas

You can test: function change(obj) { obj.foo = 4; } const myObj = { bar: 8 }; change(myObj); // if it was duplicated, the original shouldn't change console.log(myObj);

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26.03.2022

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When an object instance is passed to a function argument,

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