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@postspectacular
Last active October 25, 2022 13:30
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NFT giveaway lottery code
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))
);
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