Like sortIt() or applyIt() where we are forced to use the it variable name in
the condition?
When I started with Nim some years ago I thought that that is the only possible
way to do it in Nim -- but I always regard it as very ugly.
I just remembered that I tried successfully to use a custom variable name some
time ago. I think it was something like this:
#The original Nim version:
template applyIt*(varSeq, op: untyped) =
for i in 0 .. <varSeq.len:
let it {.inject.} = varSeq[i]
varSeq[i] = op
var nums = @[1, 2, 3, 4]
nums.applyIt(it * 3)
assert nums[0] + nums[3] == 15
# the new version with custom name
template apply*(varSeq, el, op: untyped) =
for el in mitems(varSeq):
el = op
nums = @[1, 2, 3, 4]
nums.apply(el, el * 3)
assert nums[0] + nums[3] == 15
echo nums
Personally I regard the call nums.apply(el, el * 3) as much nicer. It looks
more like the Ruby code, where we have for example
a = [ "a", "b", "c" ]
a.delete_if {|x| x >= "b" } #=> ["a"]
I have not yet investigated if other It templates like sortIt() can be
rewritten in this way too, but I hope so.
