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Check undefined in JavaScript?
Example 1: Test if a variable is undefined:
var x;
if (typeof x === "undefined") {
console.log("x is undefined");
} else {
console.log("x is defined");
}
x is undefined
Example 2: Test if a not declared variable is undefined:
if (typeof x === "undefined") {
console.log("x is undefined");
} else {
console.log("x is defined");
}
x is undefined
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