Reduce Array of objects to object of objects

Question

I want to convert an Array of objects to Object of Objects.

My data:

var pools = [{
    dce: 3,
    lts: 2,
    name: "nift nation",
  },
  {
    dce: 1049.99,
    lts: 104.999,
    name: "NSG I.NS. Mark Select",
  },
  {
    dce: 162,
    lts: 36.157,
    name: "Shift-Team Mark Select",
  }
]

Desired output:

{
  nift_nation: {
    nift_nationDollars: "",
    nift_nationUnits: "",
    nift_nationPercentage: ""
  },
  NSG_I$NS$_Mark_Select: {
    NSG_I$NS$_Mark_SelectDollars: "",
    NSG_I$NS$_Mark_SelectUnits: "",
    NSG_I$NS$_Mark_SelectPercentage: ""
  },
  Shift__Team_Mark_Select: {
    Shift__Team_Mark_SelectDollars: "",
    Shift__Team_Mark_SelectUnits: "",
    Shift__Team_Mark_SelectPercentage: ""
  }
}

 var pools = [{ dce: 3, lts: 2, name: "nift nation", }, { dce: 1049.99, lts: 104.999, name: "NSG I.NS. Mark Select", }, { dce: 162, lts: 36.157, name: "Shift-Team Mark Select", } ] var suffixArray = ["Dollars", "Percentage", "Units"]; var getFieldSuffix = function(rowFieldCount) { switch (rowFieldCount) { case 0: return 'Dollars'; case 1: return 'Units'; case 2: return 'Percentage'; default: return } }; var replacementMap = { single_space: '_', dot: '$', hyphen: '__', }; var replacer = function(str) { return str.replace(/[ .-]/g, l => { if (l == ".") return replacementMap["dot"]; if (l == " ") return replacementMap["single_space"]; return replacementMap["hyphen"]; }); }; var formStructure = function dataFormatter(collection, suffixArr) { const data = collection.map(pool => Object.assign({ [replacer(pool.name)]: suffixArr.reduce((acc, suffix, index) => { acc[replacer(pool.name) + getFieldSuffix(index % 3)] = ''; return acc; }, {}), })); return Object.assign({}, ...data); //Extra step, I don't think this is the best way } var arrObj = formStructure(pools, suffixArray); console.log(arrObj) 

I get the desired output. In formStructure function I store the result that is an Array of Objects in variable data , then in the next step return Object.assign({}, ...data); , I convert it into Object of objects . This approach is not optimum.

I want to be able to get Object of objects in variable data itself.

Answer 1

You can use exactly the same reduce approach that you are already using on the suffixArr for your collection :

function formStructure(collection, suffixArr) {
  return collection.reduce(acc, pool) => {
    acc[replacer(pool.name)] = suffixArr.reduce((acc, suffix, index) => {
      acc[replacer(pool.name) + getFieldSuffix(index % 3)] = '';
      return acc;
    }, {});
    return acc;
  }, {});
}