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JavaScript data types
JavaScript uses different kinds of values, including text, numbers, and true-or-false information. Recognizing the difference helps explain what a program is working with.
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A product name and its quantity describe different facts. Choosing an appropriate kind of value makes calculations, messages, and decisions easier to understand.
Similar-looking values can behave differently
Text, numbers, booleans, objects, and other JavaScript values represent different kinds of information. A product code that contains digits can still be a label, while a quantity is meant for arithmetic. Their appearance on screen does not establish that they have the same role.
JavaScript can convert values during some operations, which can make an unexpected result harder to interpret. Understanding the original kind of value helps explain the difference between combining text and calculating an amount. That question comes before deciding whether the result is correct.
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