Mini Programs

Short scripts. Not a tutorial series.

Countdown

fn countdown(start: int) {
    for i: int in start..0 by -1 {
        say(i);
    }
}

countdown(3);

3
2
1
0

Frequency counter

words: list = ["a", "b", "a"];
counts: hash = {};

i: int = 0;
while i < words.length() {
    word: str = words[i];
    counts[word] = counts.ensure(word, 0) + 1;
    i = i + 1;
}

say(counts);

{"a": 2, "b": 1}

JSON job report

examples/json_report.echo reads a JSON suite, prints a summary, and can write it back out.

elang examples/json_report.echo -- examples/sample_jobs.json
ECHO_REPORT=report.json elang examples/json_report.echo -- examples/sample_jobs.json

Uses args(), envOr(), readFile(), writeFile(), parseJson(), and writeJson().

Bank account

Interactive class demo: examples/bank_account.echo (also in the playground).

elang examples/bank_account.echo

Commands: deposit / withdraw / balance / exit (short: d w b q). Amounts use asFloatOr.

See Also

• Control Flow
• Lists
• Hashes