[JavaScript] - js

原题

var countSheep = function (num){
  //your code here
  var str = ' sheep...';
  var result = '';
  for (var i=1;i<num+1;++i){
    result+=(i+str);
  }
  return result;
}

CW解:

countSheep=n=>[...Array(n).keys()].map(x=>`${x+1} sheep...`).join``

var countSheep = function (n){
  return [...Array(n)].map((_,i)=>i+1+' sheep...').join``
}

const countSheep = num => {
  let val = '';
  for (let i = 1; i <= num; i++) {
    val += `${i} sheep...`;
  }
  return val;
}

https://www.codewars.com/kata/do-you-speak-english/train/javascript

function spEng(sentence){
//write your code here
  return RegExp(/english/ig).test(sentence);
}

function spEng(s){
   return /english/i.test(s)
}

https://www.codewars.com/kata/filter-out-the-geese/train/javascript

function gooseFilter (birds) {
  var geese = ["African", "Roman Tufted", "Toulouse", "Pilgrim", "Steinbacher"];

  // return an array containing all of the strings in the input array except those that match strings in geese
  var arr = [];
  for(i in birds){
      if(!(geese.indexOf(birds[i])>-1)){ //has this element
         arr.push(birds[i]);
      }
  }
  return arr;
};

function gooseFilter (birds) {
  var geese = ["African", "Roman Tufted", "Toulouse", "Pilgrim", "Steinbacher"];
  return birds.filter(b => !geese.includes(b));
};