JS implementation of simple array deduplication method example

This article mainly introduces the JS implementation of simple array deduplication and array deduplication operations based on the elements in the object, involving the traversal, judgment, appending and other operations of javascript array elements to achieve the deduplication function. Friends in need can refer to the following , hope it can help everyone.

The example of this article describes the JS implementation of simple array deduplication and array deduplication operations based on elements in the object. Share it with everyone for your reference, the details are as follows:

JS array simple deduplication

var arr1 = [1, 2, 3, 4, 5, 6, 3, 4, 3];
function arrayUnique1(arr) {
  var result = [], hash = {};
  for (var i = 0, elem; (elem = arr[i]) != null; i++) {
    if (!hash[elem]) {
      result.push(elem);
      hash[elem] = true;
    }
  }
  return result;
}
console.log(arrayUnique1(arr1));

Result:

js array deduplication based on the elements in the object

##

var arr2 = [
  { name: "name1", num: "1" },
  { name: "name2", num: "11" },
  { name: "name3", num: "12" },
  { name: "name4", num: "13" },
  { name: "name2", num: "1" },
  { name: "name6", num: "12" }
]
function arrayUnique2(arr, name) {
  var hash = {};
  return arr.reduce(function (item, next) {
    hash[next[name]] ? '' : hash[next[name]] = true && item.push(next);
    return item;
  }, []);
}
console.log(arrayUnique2(arr2, "name"));
console.log(arrayUnique2(arr2, "num"));

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