propeller.utils
Useful functions
count-points
(count-points tree)Returns the number of points in tree, where each atom and each pair of parentheses counts as a point.
depth
(depth tree)Returns the height of the nested list called tree. Borrowed idea from here: https://stackoverflow.com/a/36865180/2023312 Works by looking at the path from each node in the tree to the root, and finding the longest one. Note: does not treat an empty list as having any height.
ensure-list
(ensure-list thing)Returns a non-lazy list if passed a seq argument. Otherwise, returns a list containing the argument.
first-non-nil
(first-non-nil coll)Returns the first non-nil values from the collection, or returns nil if the collection is empty or only contains nil.
indexof
(indexof element coll)Returns the first index of an element in a collection. If the element is not present in the collection, returns -1.
not-lazy
(not-lazy lst)Returns lst if it is not a seq, or a non-lazy version of lst if it is.
random-instruction
(random-instruction instructions)Returns a random instruction from a supplied pool of instructions, evaluating ERC-producing functions to a constant literal.
seq-zip
added in 1.0
(seq-zip root)Returns a zipper for nested sequences, given a root sequence