Functions vs let

[jling]

Are let blocks as fast as functions?

Based on reading this discussion and having to write a large script (I prefer script files), I find that using functions for “for loops” is a pain in my application. Since the matrices I’m dealing with are very large (~ 9000 x 10000), I have declared them as const and used mutation/vectorization to change its values inside for loops (I am NOT iterating over rows/cols). I was wondering if this approach is good enough or should I enclose the script in a “let block” to simulate local scoping behavi…