JavaScript Scope

Local JavaScript Variables

// code here can not use carName
function myFunction() {
    var carName = "Volvo";

    // code here can use carName
}

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Global JavaScript Variables

var carName = " Volvo";

// code here can use carName
function myFunction() {

    // code here can use carName 
}
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Automatically Global

// code here can use carName
function myFunction() {
    carName = "Volvo";

    // code here can use carName
}