eng
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This is a talk about floating point numbers, specifically the sort named IEEE-754, aka "why are javascript numbers so weird", aka "nooo you can't compare floats for equality!" (Spoiler: sometimes you can.) This is a talk about why.
Floating point numbers, which are the things that most programming languages call something like "float", while Javascript just says "number", are famously weird and confusing:
```
> big_number = 1e16
10000000000000000
> 25 + big_number - big_number
24.0
> big_number == big_number + 1
true
```
In this talk, I'll show you some of my favorite weird floating point phenomena, and then I'll try to explain why they happen.
If you are a bit scared of floating point, like I used to, and you're never quite sure which formulas might turn on you and summon the eldritch abomination named NaN, then maybe this talk can help you build an ability to understand (and perhaps control) these phenomena.
This will obviously be a very numbers-heavy talk, but I'm going to try to make it as accessible as I can. Knowledge of things like binary numbers or scientific number notation is not required.
This Talk was translated into multiple languages. The files available for download contain all languages as separate audio-tracks. Most desktop video players allow you to choose between them.
Please look for "audio tracks" in your desktop video player.