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Interpretation ↔ Programming Language with Interpreter to parse & execute Source Code line by line

Interpreter

JS Interpreter​

JS Engine Component to check AST for SyntaxError, handles ASI

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Interpreted languages are much much slower than compiled languages

Old JavaScript used to be a purely interpreted language

low performance JS no longer acceptable in modern apps, browsers & mobile devices

References​

  1. Machine Code ↔ 0's & 1's. Binary Executable, generated via Interpretation or Compiled Language.

  2. JIT ↔ Mix of Interpretation & Compiled Language, used by modern JS Engine, all code compiled & executed immediately