<ul><li>JavaScript is a popular programming language used for creating interactive websites and web applications.</li><li>JavaScript supports data types like strings, numbers, booleans, null, undefined, symbols, and big integers.</li><li>Variables in JavaScript store data values and can be declared using let, const, and var.</li><li>Functions in JavaScript are reusable blocks of code that perform tasks and can have parameters, arguments, and return statements.</li></ul>

Learning JavaScript: Data Types, Functions ,Variables,Concatenation,Return

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