Initial data commit

Task/FASTA-format/JavaScript/fasta-format.js

@@ -0,0 +1,28 @@
+const fs = require("fs");
+const readline = require("readline");
+
+const args = process.argv.slice(2);
+if (!args.length) {
+    console.error("must supply file name");
+    process.exit(1);
+}
+
+const fname = args[0];
+
+const readInterface = readline.createInterface({
+    input: fs.createReadStream(fname),
+    console: false,
+});
+
+let sep = "";
+readInterface.on("line", (line) => {
+    if (line.startsWith(">")) {
+        process.stdout.write(sep);
+        sep = "\n";
+        process.stdout.write(line.substring(1) + ": ");
+    } else {
+        process.stdout.write(line);
+    }
+});
+
+readInterface.on("close", () => process.stdout.write("\n"));