text: import {randInt} from './../Number';
  
  const shuffle = (arr) =>{
    const _exch = (a, b)=>{
      [arr[a], arr[b]] = [arr[b], arr[a]];
    };
    const len = arr.length;
    for (let i = 0; i<len-1; ++i) {
      const rand = randInt(i, len-1);
      _exch(i, rand);
    }
  };
  export default shuffle;
  