问题:

So I have this function where I've need to take out the evens and odds and put them into separate arrays but I need the evens array to print first rather than the odds.

var numbersArray = [1,2,34,54,55,34,32,11,19,17,54,66,13];  function divider(numbersArray) {   var evensOdds = [[], []];     for (var i = 0; i < numbersArray.length; i++) {       evensOdds[i & 1].push(numbersArray[i]);   }   return evensOdds; }

回答1:

If you want to split the number by their even and odd values, instead of using the index (i), determine the sub array to push into using the value - numbersArray[i] % 2.

var numbersArray = [1,2,34,54,55,34,32,11,19,17,54,66,13];  function divider(numbersArray) {   var evensOdds = [[], []];   for (var i = 0; i < numbersArray.length; i++) {     evensOdds[numbersArray[i] % 2].push(numbersArray[i]);   }   return evensOdds; }  console.log(divider(numbersArray));

If you want to split them by even and odd indexes use (i + 1) % 2 to determine the sub array to push into:

var numbersArray = [1,2,34,54,55,34,32,11,19,17,54,66,13];  function divider(numbersArray) {   var evensOdds = [[], []];   for (var i = 0; i < numbersArray.length; i++) {     evensOdds[(i + 1) % 2].push(numbersArray[i]);   }   return evensOdds; }  console.log(divider(numbersArray));

回答2:

Just for fun, a forEach version of the accepted answer.

    var numbersArray = [1,2,34,54,55,34,32,11,19,17,54,66,13];     var even_odd = [ [], [] ];      numbersArray.forEach( e => even_odd[e%2].push(e) );      console.log(even_odd);

转载请标明出处:How to get even numbers array to print first instead of odds?

文章来源: How to get even numbers array to print first instead of odds?

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array