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// Missing closing bracket
function test() {console.log("error");var x = 5
var y = 10// Undefined variable
console.log(undefinedVar);for (var i = 0; i < 5; i++) {setTimeout(() => console.log(i), 100);}// Use === instead of ==
if (x == "5") { }
myGlobalVar = "bad practice";name = "John";