NFT giveaway lottery code

lottery.ts

import { int, parseCSVSimple } from "@thi.ng/csv";
import { readText } from "@thi.ng/file-io";
import { pickRandom } from "@thi.ng/random";
import { split } from "@thi.ng/strings";
import {
	comp,
	distinct,
	mapcat,
	push,
	repeat,
	repeatedly,
	run,
	take,
	trace,
	transduce,
} from "@thi.ng/transducers";

// CSV row format: address,numtokens
const addresses = transduce(
	comp(
		// parse CSV and coerce 2nd column to number
		parseCSVSimple({ header: false, cols: [true, int()] }),
		// repeat each row as many times as stated in 2nd column
		mapcat(([addr, n]) => repeat(addr, n))
	),
	// collect results as array
	push(),
	// pre-split into lines
	split(readText("owners.csv"))
);

// pick unique winners
run(
	// composed transducer:
	comp(
		// distinct/unique values only
		distinct(),
		// max number of results
		take(32),
		// side effect: output to console
		trace()
	),
	// an infinite sequence of random samples
	repeatedly(() => pickRandom(addresses))
);

winners.csv