argv

Builtin index · File I/O

result = argv()

Input: no input · Output: result

What it is

Takes no arguments.

Overloads

One call shape — this function is not overloaded.

Examples

From the documentation, and run by the build -- the output and the figure below are what the engine actually produced. Simplest first.

args = argv()
print(length(args))                      # 2 -- "data.csv" and "1000"

print(args)                              # ("data.csv", "1000")


level = getenv("QU_LOG") ?? "info"
print(level)

0
()
info

from file-io

How it works

--- Talking to the outside world ------------------------- Without these a .qu file cannot be told anything: not an input path, not a cutoff frequency, not a run label, and it cannot stamp a result with a date (timer/tic/toc are monotonic, so they measure durations and know nothing about when). That ruled out cron jobs, parameter sweeps, Makefile steps -- every use where something else drives Qu. The 38 ms cold start makes that especially galling: Qu is fast enough to be the thing you call in a loop, and had no way to hear what the loop wanted to say. argv() -- everything after -- on the command line: qu run analyse.qu -- data.csv 1000 A list of strings, empty when nothing was passed, so a script can branch on length(argv()) without a guard.

From the note above this builtin in the interpreter, where the reasoning was written down as it was built.