JavaScript lifetime of variables in JavaScript functions variables lifetime javascript

After some research and trials, I think it might work like this:

(1) Local variables and values in functions are destroyed when the function ends, unless they are referred to from outside the function. For example:

    // example 4
    var a;
    function myFunc() {
        var b = 1;
        var c = [1, 2, 3];
        a = c;
    }

    myFunc();   // variable b=1 is gone
    a;          // => [1,2,3], this value still exists

(2) The definition of a function somehow includes its "scope" which means the environment that it was defined in. So in example 1 and 2 of the original questions, the reason why "str" is remembered after the constructors are finished is NOT that the constructor functions remember them, but instead is because the "str" is remembered in the scope of each of the show functions.

Here is an example with no objects, just functions:

    // example 5
    function returnFunction() {
        var a = Math.random(0);
        return function () { return a; };
    }

    f1 = returnFunction();
    f2 = returnFunction();

    f1();  // => 0.79
    f2();  // => 0.21
    f1();  // => 0.79
    f2();  // => 0.21

Any clarification or links would be appreciated.

Answer:1

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