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//JavaScript-C24.2.0 (SpiderMonkey) print("Hello, world!") var a=10; print('The value of a is ' + a); // The value of a is undefined if(a) print('a value undefined'); print('The value of b is ' + b); // The value of b is undefined var b; // This one may puzzle you until you read 'Variable hoisting' below let x; print('The value of x is ' + x); // The value of x is undefined print('The value of y is ' + y); // Uncaught ReferenceError: y is not defined let y;
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