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  • The command-line still evaluates everything in order, as you type it... The if statement won't evaluate again unless you tell it to.

    You could do something like:

    setInterval(function() {
     if (a != b) {
        var b = a;
        var c = 1;
        var d = 1;
        var e = 1;
        var f = b+c+d+e;

    And now, that code will keep being called every 100ms so if you write a=20, everything will update as you expect.


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