Replacing values between Arrays and Objects

Question

Replacing values between Arrays and Objects

I currently possess a lookupMap variable that contains an index of counties and their corresponding codes. Here is a snippet:

{ ANDERSON: { county: 'ANDERSON', code: 'us-tx-001' },  
ANDREWS: { county: 'ANDREWS', code: 'us-tx-003' } ,
WARD: { county: 'WARD', code: 'us-tx-475' },
WASHINGTON: { county: 'WASHINGTON', code: 'us-tx-477' },
WEBB: { county: 'WEBB', code: 'us-tx-479' }}

Though not all counties will be utilized, it serves as a useful reference.

In addition to this, I have another variable called uniquedata which consists of an array of codes:

[ 'us-tx-477', 'us-tx-479' ]

Furthermore, I have results stored in the var results variable like so:

{ WASHINGTON: 9, WEBB: 4 }

My task now is to iterate through each element in uniquedata, find its corresponding county name, and replace the county name with the code while keeping the count unchanged.

For instance, the expected output should look like this:

{ 'us-tx-477' : 9,
 'us-tx-479': 4}

Could you suggest the most effective approach for accomplishing this? I am encountering difficulties in isolating elements and finding the process rather perplexing. Your expertise would be greatly appreciated.

javascript arrays object

Answer 1

Answer №1

Loop through each item in uniquedata and perform a search in the data object. The method findInLookupMap scans through each entry in the lookupmap and retrieves the county name for a given code.

Here's an example snippet:

var cache = {}; 
function findInLookupMap(key){
  if(cache[key]) return cache[key]; // <--- Utilizing cache to avoid repeated searches
  for(var o in data){ 
    if(data[o].code == key){
      cache[key] = data[o].county;
      return data[o].county;
    }
  }
}

var output = {};
for(var i=0;i<uniquedata.length;i++){ // <--- Iterating over each item in uniquedata
  var code = findInLookupMap(uniquedata[i]);
  output[uniquedata[i]] = results[code];
}
console.log(output);

var lookupMap = {
  "ANDERSON": {
    "county": 'ANDERSON',
    "code": 'us-tx-001'
  },
  "ANDREWS": {
    "county": 'ANDREWS',
    "code": 'us-tx-003'
  },
  "WARD": {
    "county": 'WARD',
    "code": 'us-tx-475'
  },
  "WASHINGTON": {
    "county": 'WASHINGTON',
    "code": 'us-tx-477'
  },
  "WEBB": {
    "county": 'WEBB',
    "code": 'us-tx-479'
  }
};
var uniquedata = ['us-tx-477', 'us-tx-479'];

var results = {
  WASHINGTON: 9,
  WEBB: 4
};
var cache = {};

function findInLookupMap(key) {
  if (cache[key]) return cache[key];
  for (var o in lookupMap) {
    if (lookupMap[o].code == key) {
      cache[key] = lookupMap[o].county;
      return lookupMap[o].county;
    }
  }
}
var output = {};
for (var i = 0; i < uniquedata.length; i++) {
  var code = findInLookupMap(uniquedata[i]);
  output[uniquedata[i]] = results[code];
}
console.log(output);

Answer 2

Loop through each item in uniquedata and perform a search in the data object. The method findInLookupMap scans through each entry in the lookupmap and retrieves the county name for a given code.

Here's an example snippet:

var cache = {}; 
function findInLookupMap(key){
  if(cache[key]) return cache[key]; // <--- Utilizing cache to avoid repeated searches
  for(var o in data){ 
    if(data[o].code == key){
      cache[key] = data[o].county;
      return data[o].county;
    }
  }
}

var output = {};
for(var i=0;i<uniquedata.length;i++){ // <--- Iterating over each item in uniquedata
  var code = findInLookupMap(uniquedata[i]);
  output[uniquedata[i]] = results[code];
}
console.log(output);

var lookupMap = {
  "ANDERSON": {
    "county": 'ANDERSON',
    "code": 'us-tx-001'
  },
  "ANDREWS": {
    "county": 'ANDREWS',
    "code": 'us-tx-003'
  },
  "WARD": {
    "county": 'WARD',
    "code": 'us-tx-475'
  },
  "WASHINGTON": {
    "county": 'WASHINGTON',
    "code": 'us-tx-477'
  },
  "WEBB": {
    "county": 'WEBB',
    "code": 'us-tx-479'
  }
};
var uniquedata = ['us-tx-477', 'us-tx-479'];

var results = {
  WASHINGTON: 9,
  WEBB: 4
};
var cache = {};

function findInLookupMap(key) {
  if (cache[key]) return cache[key];
  for (var o in lookupMap) {
    if (lookupMap[o].code == key) {
      cache[key] = lookupMap[o].county;
      return lookupMap[o].county;
    }
  }
}
var output = {};
for (var i = 0; i < uniquedata.length; i++) {
  var code = findInLookupMap(uniquedata[i]);
  output[uniquedata[i]] = results[code];
}
console.log(output);

Replacing values between Arrays and Objects

Answer №1

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