Common Patterns
This page is intended as a list of commonly used snippets and functions that can be used in K code.
If you would like to add to this list, modify the template given in Format: Common Pattern and paste it in.
Patterns
Sum
+/
Description: function to sum an array. Can be used with initial value.
Examples
+/1 2 3 4 5 -> 15
+/(1 2;2 3) -> 3 5
Dialects: all
Deltas
-':
Description: Function to find the differences between members of an array. Comes in various flavors.
Examples:
-':1 2 3 4 -> 1 1 1 1 /the builtin eachp prepends an array with zero before evaluation, so the output is the same size
-':5 2 4 8 -> 5 -3 2 4
{y/(1_;-1_)@\:x}[6 7 8;-] -> 1 1 /you can substitute the default eachp with your own for different behaviour, like this shakti example that just evaluates over each pair in x without prepending 0
-':6 7 8 -> 6 1 1 /the difference is highlighted here
Dialects: all, syntax may vary