Double Integers

For each line in the input, print its double.<script>alert(5)</script>

Judge

(async function*(context: Context): Challenge {  
  yield* context.runTestCases(
    range(1000).map(i=>[''+i, ''+(i*2)])
  );
  return context.noFailures();
})

Example Code

var fs = require("fs");
var stdinBuffer = fs.readFileSync(0); // STDIN_FILENO = 0
console.log(stdinBuffer.toString().split("\n").map(k=>(+k)*2).join("\n"));