Q209124

by jun68ykt

HTML

<div id="test"></div>

JavaScript

var arr = [
  ["ax","a","y",1,"2019/07/31"],
  ["a","xa","y",1,"2019/03/31"],  
  ["ax","a","y",1,"2019/08/31"],
  ["a","xa","y",1,"2019/04/30"],  
  ["ax","a","y",1,"2019/06/30"],
  ["a","xa","y",1,"2019/05/31"]
];

//並び替え
arr.sort(function(a, b) {

  if(a[0] > b[0]){return 1;}
  else if(a[0] < b[0]){return -1;}
  else if(a[1] > b[1]){return 1;}
  else if(a[1] < b[1]){return -1;}
  else if(a[2] > b[2]){return 1;}
  else if(a[2] < b[2]){return -1;}
  else if(a[4] > b[4]){return -1;}
  else if(a[4] < b[4]){return 1;}
  else{return 0;}

});

var arr2 = arr.filter(function (x, i, self) {
  if ( i ===0 )
    return true;
  else {
    const y = self[i-1];
    return x[0] !== y[0] || x[1] !== y[1] || x[2] !== y[2];
  }
});

for (var i = 0; i < arr2.length; i++) {
  test.innerHTML += arr2[i] + "<br>";

}