Scripter Javascript Tutorial

13 const

MDN: Grammar and types: Constants

If there is a value which is read-only (it needs to never change), then the const keyword is used, short for “constant”. Constants are typically in all caps to make them easy to identify.

const MIDDLE_C = 60;

Scripter will throw an error if there is a re-assignment of the variable middle_c:

const MIDDLE_C = 60;
MIDDLE_C = 0;

***Creating a new MIDI engine with script***

Evaluating MIDI-processing script...
Script failed to evaluate:
[JS Exception] TypeError: Attempted to assign to readonly property. line:2
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