For those considering using the tilde trick to create a truthy value from an indexOf result, it is more explicit and has less magic to instead use the includes method on String. ... Note that this is a new standard method as of ES 2015 so it won't work on older browsers. In cases where that matters, consider using the String.prototype.includes ...
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Just to complete things further, the tilde operator is documented for integers at This clear's things up for me a bit. I was a bit confused because in Python integers are arbitrary precision by default, unlike C where we usually have integer sizes like 32 or 64 bits, so it is a bit hard to understand what binary operations mean in Python.