JavaScript how to force variable declaration in javascript or how to check it? force variable declaration vba,force variable declaration,powershell force variable

Though you can use a variable without declaring it in javascript, the misuse of variable will cause hard-to-solve errors. For example, the following code will cause endless loop.

  for(i=0;i<100;i++){
    document.write(fiveTimes(i));
  }
  ...

  function fiveTimes(x){
    i=5;
    return (i*x);
  }

I'd like to know if there is a way to force every variable in the javascript to be declared before use. Or anybody knows how to check for variable declaration-before-using in tons of javascript files and blocks in a huge web server.

Answer:1

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