interpreter
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An interpreter is a program that reads and directly executes source code line-by-line without first converting it into a separate compiled file. This matters because it allows code to run immediately without the extra preparation step that compiled languages require, making it faster to test and debug programs.
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W3sDesign Interpreter Design Pattern UML
In computing, an interpreter is software that executes source code without first compiling it to machine code. An interpreted runtime environment differs from one that processes CPU-native executable code which requires translating source code before executing it. An interpreter may translate the source code to an intermediate format, such as bytecode. A hybrid environment may translate the bytecode to machine code via just-in-time compilation, as in the case of .NET and Java, instead of interpreting the bytecode directly.