[JS] Code Snippets

Combination

• str의 조합을 리턴

function substrings(str) {
  let arr = [];
  for (let x = 0, y = 1; x < str.length; x++, y++) {
    arr[x] = str.substring(x, y);
  }
  let combi = [];
  let temp = '';
  let len = Math.pow(2, arr.length);

  for (let i = 0; i < len; i++) {
    temp = '';
    for (let j = 0; j < arr.length; j++) {
      if (i & Math.pow(2, j)) {
        temp += arr[j];
      }
    }
    if (temp !== '') {
      combi.push(temp);
    }
  }
  return combi;
}