使用javascript比较多个对象

Question

I had a array of objects (multiple objects) and want to compare them with dynamically added objects.

currently my code looks like

public compare(row) {
    for (var i = 0; i < row.length; i++) {
      var a = row[i];
      console.log(a, 'first array !!!!!!!');

      var b = row[i + 1];
      console.log(b, 'Second array !!!!!!!');

      if (a != undefined && b != undefined) {
        return JSON.stringify(a) === JSON.stringify(b);
      }
      else {
        return false;
      }

    }
  }

but I'm able to compare only first two records only . is there a way to compare the objects dynamically using javascript. Thanks in Advance...

Answer 1

Your loop always returns at the end of the first loop. You only want to return false inside the loop if you find a mismatch, otherwise let the loop continue. If it doesn't find any mismatches, then you know your objects match, and you can return true.

public compare(row) {
  for (var i = 0; i < row.length - 1; i++) {
    var a = row[i];
    var b = row[i + 1];
    if (!a || !b) {
      continue;
    }

    if (JSON.stringify(a) !== JSON.stringify(b)) {
      return false;
    }
  }

  return true;
}

I've also set the loop to only continue while i < row.length - 1 , since there is no element at row[row.length] .

DEMO

 var equal = [ { a: 1 }, undefined, { a: 1 }, { a: 1 } ]; var notEqual = [ { a: 1 }, undefined, { a: 1 }, { a: 1 }, { a: 2 } ]; function compare(row) { for (var i = 0; i < row.length - 1; i++) { var a = row[i]; var b = row[i + 1]; if (!a || !b) { continue; } if (JSON.stringify(a) !== JSON.stringify(b)) { return false; } } return true; } console.log('should be true: ', compare(equal)); console.log('should be false: ', compare(notEqual));