使用lodash將數組平均分塊

Question

我countries.json這我分塊中4列，按規格來顯示。

我正在尋找一種將數組元素均勻分布到所有四個數組的解決方案。

樣本JSFIDDLE https://jsfiddle.net/5tkjLs7b/

如果我從json數據中刪除一個國家/地區，則最終會得到6個數組。 但預期只有4個陣列。

此外，數據應均勻分布。

例子：我得到63項* 4數組+ 3項* 1數組，用於整個country.json。

var countries = [ 
  {"name": "Afghanistan", "code": "AF"}, 
  {"name": "Åland Islands", "code": "AX"}, 
  {"name": "Albania", "code": "AL"}, 
  {"name": "Algeria", "code": "DZ"}, 
  {"name": "American Samoa", "code": "AS"}, 
  {"name": "AndorrA", "code": "AD"}, 
  {"name": "Angola", "code": "AO"}, 
  {"name": "Anguilla", "code": "AI"}, 
  {"name": "Antarctica", "code": "AQ"}, 
  {"name": "Antigua and Barbuda", "code": "AG"}, 
  {"name": "Argentina", "code": "AR"}, 
  {"name": "Armenia", "code": "AM"}];

  chunkedCountries = _.chunk(countries, countries.length/4)
  console.log(chunkedCountries);

Answer 1

您可以使用for循環和slice()獲得所需的結果。

 var countries = [ {"name": "Afghanistan", "code": "AF"}, {"name": "Åland Islands", "code": "AX"}, {"name": "Albania", "code": "AL"}, {"name": "Algeria", "code": "DZ"}, {"name": "American Samoa", "code": "AS"}, {"name": "AndorrA", "code": "AD"}, {"name": "Angola", "code": "AO"}, {"name": "Anguilla", "code": "AI"}, {"name": "Antarctica", "code": "AQ"}, {"name": "Antigua and Barbuda", "code": "AG"}, {"name": "Argentina", "code": "AR"}, {"name": "Armenia", "code": "AM"}]; var c = countries.length / 4; var result = []; for(var i = 0; i < countries.length; i+=c) { result.push(countries.slice(i, i+c)); } console.log(result)