Join arrays by concat or spread

Compare loop performance

Compare loop performance

https://developer.mozilla.org/en-US/docs/Web/API/structuredClone

Compares performance of a function call with parameter list, against other methods of getting the data into the function

Updated to add 'Pass new object' & 'Pass re-created object', these reflect common real-world usage where the object contents are changing

Object lookup performance

flatMap vs map filter

find best solution for concatenate strings

https://developer.mozilla.org/en-US/docs/Web/API/structuredClone