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Most of the discussions on scripting languages tend to be focused on the syntax, or sometimes the performance comparison. However, it is also important to know how scripting engines are integrated into applications.

This document investigates embedding APIs of selected scripting engines, focusing on how the following common tasks are implemented.

1. Evaluate an expression reading from a string
2. Execute a script reading from stream
3. Catch an exception thrown by a script
4. Set/get a variable without parsing
5. Call a function/method without parsing scripts
6. Parse a script without executing
7. Compile a script without executing