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typeof a_string;
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typeof a_boolean;
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typeof a_undefined;
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typeof a_null;
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<!DOCTYPE html>
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<html lang="en">
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<head>
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<meta charset="UTF-8">
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<meta http-equiv="X-UA-Compatible" content="IE=edge">
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<meta name="viewport" content="width=device-width, initial-scale=1.0">
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<title>Day 1</title>
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</head>
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<body>
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<script src="variable.js"></script>
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<script src="datatypes.js"></script>
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<script src="script.js"></script>
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</body>
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</html>
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//Comments can make code readable
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//Welcome to 30DayOfJavaScript
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/*
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comments can make code readable, easy to reuse and informative
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*/
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console.log("I am " + myAge + " years old\nYou are " + yourAge + " years old")
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let a_string = "any string";
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let a_boolean = true;
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let a_undefined = undefined;
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let a_null = null;
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let a_string_1;
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let a_boolean_1;
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let a_undefined_1;
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let a_null_1;
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let first_name = "tran";
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let last_name = "hoang";
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let country = "viet nam";
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let age = 22;
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let first_name_1 = first_name,
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last_name_1 = last_name,
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country_1 = country,
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age_1 = age;
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let myAge = 22;
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let yourAge = 30;
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