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Introduction to JavaScript III

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Primitives vs References

Primitives are copied by their value.
Objects are copied by their reference(memory address)

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console.log("----primitives")
let number = 10;
function increase(number){
    number++;
    console.log(number); // 11

}
increase(number);
console.log(number); // 10

console.log("----references")
let obj = {value:10};
function increaseObj(obj){
    obj.value++;
    console.log(obj.value) // 11
}
increaseObj(obj);
console.log(obj.value); // 11

Thanks for @Mosh‘s great video tutorials.

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