hackerrank pairs code dojo with @sranso

Week7.ipynb

Week7.js

function processData(input) {
    function pair(k, set) {
      var count = 0;
      function countPair(value, _value, _set) {
        if ( set.has(value + k) ) {
          count += 1;
        }
      }
      set.forEach(countPair);
      return count;
    }
    
    function toInt(value, _index, _array) {
        return parseInt(value)
    };
    var split = input.split('\n');
    var k = parseInt(split[0].split(' ')[1]);
    var inputSet = new Set(split[1].split(" ").map(toInt));
    var result = pair(k, inputSet);
    return result;
} 

process.stdin.resume();
process.stdin.setEncoding("ascii");
_input = "";
process.stdin.on("data", function (input) {
    _input += input;
});

process.stdin.on("end", function () {
   console.log(processData(_input));
});