Software

JavaScript Array Group

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Managing, sorting, and manipulating information with JavaScript is a ability we have usually delegated to 3rd get together libraries like lodash. Because the JavaScript language progresses, nevertheless, these options ultimately get. added to the JavaScript specification. Two such APIs for grouping of Array information are `Array.prototype.group and Array.prototype.groupToMap.

Array.prototype.group

To group an array of objects by a given property, name the group technique with operate that returns the grouping string:

const groups = [
  { name: "Arsenal", origin: "London", tier: "legendary" },
  { name: "Manchester United", origin: "Manchester", tier: "legendary" },
  { name: "Liverpool", origin: "Liverpool", tier: "legendary" },
  { name: "Newcastle United", origin: "Newcastle", tier: "mid" },
  // Lol, awful club
  { name: "Tottenham", origin: "London", tier: "lol" },
];

const tieredTeams = groups.group(({ tier }) => tier);

The results of the array’s group is an object with keys that match the grouping key:

{
  legendary: [
    {name: "Arsenal", origin: "London", tier: "legendary"},
    {name: "Manchester United", origin: "Manchester", tier: "legendary"},
    {name: "Liverpool", origin: "Liverpool", tier: "legendary"}
  ], 
  mid: [
    {name: "Newcastle United", origin: "Newcastle", tier: "mid"}
  ], 
  lol: [
    {name: "Tottenham", origin: "London", tier: "lol"}
  ]
}

Array.prototype.groupToMap

groupToMap returns a Map occasion as an alternative of an object literal:

const tieredTeamsMap = groups.group(({ tier }) => tier);

tieredTeamsMap.has('lol') // true

tieredTeamsMap.get('lol') // [{name: "Tottenham", origin: "London", tier: "lol"}]

As of the time of publish, group and groupToMap are solely accessible in Safari. These two strategies are essential to information administration transferring ahead. Whether or not you are manipulating information on consumer or server aspect, these newly added native strategies are a lot welcomed.


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