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I can’t find a complete syntax spec on the developer pages. I’m really wondering if there’s an extended for loop …
https://developers.google.com/apps-script/
I see the Default services, but that isn’t defining what control flow syntax we can use. Is it precisely some version of JavaScript?
The GAS is not a precise version of JavaScript. It supports many features of JavaScript 1.8.5 like
Object.keys,Object.isExtensible, etc. but on the other hand it does not support the keywordsyieldandletintroduced in JavaScript 1.7. Another features which the GAS supports are the nativeJSONclass andString.trimfunction introduced in JavaScript 1.8.1. Also the GAS supports the E4X extension.The GAS documentation is not complete now and many features are discoverable experimentally.