April 2018
Beginner to intermediate
426 pages
10h 19m
English
Content preview from Learning JavaScript Data Structures and Algorithms - Third Edition
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Variables
Variables store data that can be set, updated, and retrieved whenever necessary. Values that are assigned to a variable belong to a type. In JavaScript, the available types are number, string, boolean, function, and object. We also have undefined and null, along with arrays, dates, and regular expressions.
Although JavaScript has different available variable types, it is not a strongly typed language such as C/C++, C#, and Java. In strongly typed languages, we need to declare the type of the variable along with its declaration (for example, in Java, to declare an integer variable, we use int num = 1;). In JavaScript, we only need to use the keyword var, and we do not need to declare the variable type. For this reason, JavaScript ...
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