Javascript in array then return key

Question

I'm trying to find the ean codes from below array in the variantCodesObject. That part I can get working however I'm struggeling to return the key from the variantCodesObject.

cart array
[
  {"ean": "7350038272416","quantity": 1},
  {"ean": "7350038270276","quantity": 3}
]


variantCodesObject array

[
 { 261584049: "7350038272416" },
 { 261583813: "7350038274120" },
 { 261583424: "7350038270276" },
 { 261122928: "210000018685" },
]

cart.forEach(function (cartItem){    
  var ean = cartItem.ean;
  var qty = cartItem.quantity;

  if(variantCodesObject.indexOf(ean)){
    
    makeSomeRequest(??, qty) //How do I get the key of the found EAN's here?

  }

})

In above example how do I get for ean 7350038272416 the key value 261584049?

I tried something like this:

variantCodesObject.forEach(function(item){
          if(item.indexOf(ean)){
            Object.keys(item).forEach(function(key) {
              console.log("key:" + key + "value:" + item[key]);
            });
          }
        });

But that returns the full variantCodesObject.

Any chance you could modify your variantCodesObject array? It could look like this: [ { id: 261584049, ean: 7350038272416 }...] and then you could just return the id. — Andy
– Andy, Commented May 9, 2022 at 14:23
if(variantCodesObject.indexOf(ean)) makes little sense to begin with, you would be comparing an array with a scalar value here. — C3roe
– C3roe, Commented May 9, 2022 at 14:24

mhodges · Accepted Answer · 2022-05-09 14:28:37Z

1

You can do this by checking the value of the object in the variantCodesObject against the .ean property on each cart item. If it matches, do whatever you'd like with the key

cart = [
  {"ean": "7350038272416","quantity": 1},
  {"ean": "7350038270276","quantity": 3}
]


variantCodesObject = [
 { 261584049: "7350038272416" },
 { 261583813: "7350038274120" },
 { 261583424: "7350038270276" },
 { 261122928: "210000018685" },
]


cart.forEach(item => {
  variantCodesObject.forEach(obj => {
    Object.entries(obj).forEach(([key, value]) => {
      if (value === item.ean) {
        console.log(key);
      }
    });
  })
})

answered May 9, 2022 at 14:28

mhodges

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1 Comment

Meules Over a year ago

Excellent! I had sopme sort of the same but did not put it together like you did. Anyway thx for the help!

vanowm · Accepted Answer · 2022-05-09 14:29:26Z

0

One method would be to use Array.reduce() to gather data from the array:

const cart =
[
  {"ean": "7350038272416","quantity": 1},
  {"ean": "7350038270276","quantity": 3}
]


const variantCodesObject =
[
 { 261584049: "7350038272416" },
 { 261583813: "7350038274120" },
 { 261583424: "7350038270276" },
 { 83424: "7350038270276" },
 { 261122928: "210000018685" },
]

cart.forEach(function (cartItem){    
  var ean = cartItem.ean;
  var qty = cartItem.quantity;

  const keys = variantCodesObject.reduce((ret, obj) =>
  {
    for(let key in obj)
      if (obj[key] == ean)
        ret[ret.length] = key;

    return ret;
  }, []);

  console.log(ean, "=", keys);

})

answered May 9, 2022 at 14:29

vanowm

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Comments

Anbin Muniandy · Accepted Answer · 2022-05-09 14:30:02Z

You can create a "Reverse Lookup Table". Here is how you can do that.

var cartArray = [
  { ean: '7350038272416', quantity: 1 },
  { ean: '7350038270276', quantity: 3 },
];

var variantCodesObjectArray = [
  { 261584049: '7350038272416' },
  { 261583813: '7350038274120' },
  { 261583424: '7350038270276' },
  { 261122928: '210000018685' },
];

// We are creating a lookup / dictionary by mapping the "EAN" to the "CODE"
var reverMappedCodesObjectArray = {};

variantCodesObjectArray.forEach(function (entry) {
  var key = Object.keys(entry)[0];
  reverMappedCodesObjectArray[entry[key]] = key;
});

cartArray.forEach(function (cartItem) {
  var ean = cartItem.ean;
  var qty = cartItem.quantity;

  console.log(reverMappedCodesObjectArray[ean]);
});

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