Deno and Swift scripts to reverse H2 headers in text

ReverseH2.swift

#!/usr/bin/swift
/*
  Reads stdin, requiring UTF8-encoded text.

  Parses it as initial text followed by a sequence of H2 markdown blocks.

  Prints to stdout the initial text plus the H2 blocks in reversed order.

*/
import Foundation

let s = AnyIterator { readLine() }.joined(separator: "\n")
let splitter = "\n## "
let ss = s.components(separatedBy:splitter)
let out = ss[0] + ss[1...].reversed().map({ splitter + $0 }).joined(separator:"")
print(out)

ReverseH2.ts

#!/usr/local/bin/deno run -q
/*
  Reads stdin, requiring UTF8-encoded text.

  Parses it as initial text followed by a sequence of H2 markdown blocks.

  Prints to stdout the initial text plus the H2 blocks in reversed order.

*/
const s = new TextDecoder().decode(await Deno.readAll(Deno.stdin));
const splitter = "\n## ";
const [first, ...rest] = s.split(splitter);
const out = first + rest.reverse().map( x => splitter + x ).join("");
console.log(out);