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document sum

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Connor Olding 2021-08-01 07:09:21 -07:00
parent 687f9adfa8
commit 0b05eaa4b5
1 changed files with 9 additions and 0 deletions
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sh/sum
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@ -4,6 +4,15 @@
# YES_DASH
sum() { ### @-
### compute the summation of its arguments without forking processes.
### this relies on the shell's built-in arithmetic operators.
###
### ```
### $ sum 1 2 3
### 6
### ```
###
### **TODO:** consider renaming because sum(1) already exists.
local sum=0
for i; do
: $((sum+=i))