What Did You Learn This Week --April 24?

This week I learned about binding default values to dynamically created lambdas in python.

## WRONG 💥
files = ['abc', 'def', 'ghi', 'jkl']
funcs = []
for file in files:
   funcs.append(lambda: print(file))
funcs[0]()

😲 This prints 'jkl'. in fact every function prints 'jkl', they just print the latest value of 'jkl'

## CORRECT 🎉
files = ['abc', 'def', 'ghi', 'jkl']
funcs = []
for file in files:
   funcs.append(lambda x=file: print(x))
funcs[0]()

Now this is more of what I was looking for. The value of file was bound to the lambda upon creation, and will print out each value of the list as intended... Hard lesson learned this week.

This week was a productive one!

• I improved last week TypeScript unit testing
• Created particles emitters

• Learnt about Spatial Hash Maps to improve performances of particles (w/ help of another contributor)
• Fixed the collision system that was just random, now it has math 🤣

• Created particles absorbers (black holes)

• A lot of refactoring and bug fixing, but it's not much exciting 🤣