Iterating through JavaScript objects using the foreach method

Question

Iterating through JavaScript objects using the foreach method

I'm having difficulty with a JavaScript algorithm. I am working with Vue as my framework and state management tool. I have an object that needs to be 'calculated' as variants.

For instance, I have 3 objects with some values as arrays, like this:

"attributes":[
   {
      "title":{
         "text":"Size",
         "value":"1"
      },
      "values":[
         "M",
         "L",
         "X"
      ]
   },
   {
      "title":{
         "text":"Color",
         "value":"2"
      },
      "values":[
         "Red",
         "Green",
         "Black"
      ]
   },
   {
      "title":{
         "text":"Material"
      },
      "values":[
         "Cotton",
      ]
   }
]

Therefore, the state for this is obviously attributes. What I need to accomplish is to iterate through each attribute value and create a variant for every possible combination, then log them to the console. For example:

M/Red/Cotton, L/Red/Cotton, X/Red/Cotton, M/Green/Cotton, L/Green/Cotton, X/Green/Cotton, M/Black/Cotton, L/Black/Cotton, X/Black/Cotton

I've started a function that only iterates through attributes, so now I need to iterate through values and generate those codes mentioned above, but I'm not sure how to proceed. This is what I have so far:

addVariant: function (text) {
          this.attributes.forEach(element => console.log(element));
        },

javascript vue.js

Answer 1

Answer №1

It seems like you're interested in generating the Cartesian product of multiple arrays in JavaScript.

For your specific situation, the code snippet below may be precisely what you need:

addVariant: function (text) {
    let cartesian = (...arrays) => arrays.reduce((a, b) => a.flatMap(d => b.map(e => [d, e].flat())), []);
    
    let values = this.attributes.map(attr => attr.values);
    let combinations = cartesian(...values).map(val => val.join('/'));
    console.log(combinations);
},

Answer 2

It seems like you're interested in generating the Cartesian product of multiple arrays in JavaScript.

For your specific situation, the code snippet below may be precisely what you need:

addVariant: function (text) {
    let cartesian = (...arrays) => arrays.reduce((a, b) => a.flatMap(d => b.map(e => [d, e].flat())), []);
    
    let values = this.attributes.map(attr => attr.values);
    let combinations = cartesian(...values).map(val => val.join('/'));
    console.log(combinations);
},

Answer 3

Answer №2

You can utilize the combination of array#reduce, array#map, and array#flatMap to create a cartesian product of various values.

const attributes = [ { "title":{ "text":"Size", "value":"1" }, "values":[ "M", "L", "X" ] }, { "title":{ "text":"Color", "value":"2" }, "values":[ "Red", "Green", "Black" ] }, { "title":{ "text":"Material" }, "values":[ "Cotton", ] } ],
    result = attributes.reduce((r, o, i) => {
      const array = o.values.map(v => v);
      return i ? array.flatMap(v => r.map(w => (w + '\\' + v))): array;
    },[]);
console.log(result.join());

.as-console-wrapper { max-height: 100% !important; top: 0; }

Answer 4

You can utilize the combination of array#reduce, array#map, and array#flatMap to create a cartesian product of various values.

const attributes = [ { "title":{ "text":"Size", "value":"1" }, "values":[ "M", "L", "X" ] }, { "title":{ "text":"Color", "value":"2" }, "values":[ "Red", "Green", "Black" ] }, { "title":{ "text":"Material" }, "values":[ "Cotton", ] } ],
    result = attributes.reduce((r, o, i) => {
      const array = o.values.map(v => v);
      return i ? array.flatMap(v => r.map(w => (w + '\\' + v))): array;
    },[]);
console.log(result.join());

.as-console-wrapper { max-height: 100% !important; top: 0; }

Answer 5

Answer №3

It seems like you are interested in creating combinations of attribute values, correct? I came across a solution for generating combinations using arrays in JavaScript. Although I don't fully understand how it works, I simply copied the code provided.

Returning to your query, my approach would involve creating an array containing all attribute values like this:

parts = attributes.map(attribute => attribute.values)

If you apply the code from the aforementioned answer, you should obtain the desired result:

parts.reduce((a, b) => a.reduce((r, v) => r.concat(b.map(w => [].concat(v, w))), []));

Your addVariant function could be structured as follows:

addVariant: function (text) {
  const parts = this.attributes.map(attribute => attribute.values);
  const combinations = parts.reduce((a, b) => a.reduce((r, v) => r.concat(b.map(w => [].concat(v, w))), []));
  console.log(combinations)
},

Answer 6

It seems like you are interested in creating combinations of attribute values, correct? I came across a solution for generating combinations using arrays in JavaScript. Although I don't fully understand how it works, I simply copied the code provided.

Returning to your query, my approach would involve creating an array containing all attribute values like this:

parts = attributes.map(attribute => attribute.values)

If you apply the code from the aforementioned answer, you should obtain the desired result:

parts.reduce((a, b) => a.reduce((r, v) => r.concat(b.map(w => [].concat(v, w))), []));

Your addVariant function could be structured as follows:

addVariant: function (text) {
  const parts = this.attributes.map(attribute => attribute.values);
  const combinations = parts.reduce((a, b) => a.reduce((r, v) => r.concat(b.map(w => [].concat(v, w))), []));
  console.log(combinations)
},

Iterating through JavaScript objects using the foreach method

Answer №1

Answer №2

Answer №3

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