Good news, fans of modern JavaScript. We just added support for the nullish coalescing operator, optional chaining operator, and logical assignment operators. See this notebook for details:
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This is great.
I noticed that on my phone (iPhone) the bottom two cells error with “Unexpected token ‘=’”.
Does using these features incur a risk that they may be unsupported on some platforms?
Absolutely, since Observable does not transpile* your code. Check the compatibility table here (you may need to scroll up a little, in case the row is covered by the table header):
https://kangax.github.io/compat-table/es2016plus/#test-Logical_Assignment
* Except for Observable-specific syntax like viewof and mutable references
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