What are the ideas in programming that once you saw you could never go back looking into other programs the same way.
For e.g, one a recent HN thread about units[0] one user shared a F# snippet like this
unit type Meters = m
unit type Seconds = s
val speed = 5.4 m/s
Some other ideas that changed the way i look at programs.
* Lisp Macros
* First class functions. Passing functions as a value is something that i do everyday.
* Garbage collection. Not having to worry about memory allocation is such a relief.
The last 2 points are surprisingly a common pattern now, but for someone coming from C[2] and shell scripting its a whole different world here.
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[0]: https://news.ycombinator.com/item?id=30749134
[1]: In school we were made to write units next to values, Now that ive seen it, i ask myself why don't more languages support this.
[2]: i'm aware of function pointers in C but its something that i rarely used(iirc qsort expected it).