Which language is case-sensitive?

JavaScript is a case-sensitive language. This means that language keywords, variables, function names, and any other identifiers must always be typed with a consistent capitalization of letters. The while keyword, for example, must be typed “while”, not “While” or “WHILE”.

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Is program code case-sensitive?

Almost of program languages these day are case-sensitive . When you writing source code, if your language expect some words to be all lowercase, then you should always write all lowercase. If you write the other way, compiler or interpreter will not understand that word and resulting as error.

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