What is the best method for iterating through an array and generating a glossary list organized by categories?

Question

What is the best method for iterating through an array and generating a glossary list organized by categories?

I have an array filled with definitions. How can I use Vue.js to iterate through this array and create a glossary list organized by letters?

Desired Output:

A

Aterm: A definition of aterm

B

Bterm: A definition of bterm

C

Cterm: A definition of cterm
Cterm: A definition of cterm
Cterm: A definition of cterm

Y

Yterm: A definition of yterm
Yterm: A definition of yterm

Z

Zterm: A definition of zterm

<div id="app" class="container">
  <div v-for="(item, index) in fields" :key="index">
    <span>{{ item.Term.charAt(0) }}
    <h3>{{ item.Term }}</h3>
    <p>{{ item.Definition }}</p>
  </div>
</div>

<script>
var app = new Vue({
  el: '#app',
  data: {
    parentMessage: 'Parent',
    fields: [
      { Term: 'Aterm', Definition: 'A definition for aterm' },
      { Term: 'Bterm', Definition: 'A definition for bterm' },
      { Term: 'Cterm', Definition: 'A definition for cterm' },
      { Term: 'Cterm', Definition: 'A definition for cterm' },
      { Term: 'Cterm', Definition: 'A definition for cterm' },
      { Term: 'Mterm', Definition: 'A definition for mterm' },
      { Term: 'Yterm', Definition: 'A definition for yterm' },
      { Term: 'Yterm', Definition: 'A definition for yterm' },
      { Term: 'Zterm', Definition: 'A definition for zterm' }
    ]
  },
  methods: {
    // do something
  }
})
</script>

javascript arrays vue.js loops vuejs2

Answer 1

Answer №1

Create a computed property that organizes the fields alphabetically by letter (using Array.prototype.reduce() on this.fields[]):

new Vue({
  computed: {
    fieldsByLetter() {
      const groups = this.fields.reduce((previous, current) => {
        const letter = current.Term.charAt(0).toUpperCase(); // using uppercase first letter
        previous[letter] ??= []; // create an array for this letter if it doesn't exist
        previous[letter].push(current); // add current field to the array
        return previous; // return updated object
      }, {});

      // sort fields by Term alphabetically
      Object.values(groups).forEach(fields => fields.sort((a, b) => a.Term.localeCompare(b.Term)));

      return groups;
    }
  },
})

Next, loop through the computed object with v-for, display the fields[] of the object using its own v-for, and each item in a <li> element to achieve the desired output:

<div id="app" class="container">
  <div v-for="(fields, letter) in fieldsByLetter" :key="letter">
    <h3>{{ letter }}</h3>
    <ul>
      <li v-for="item in fields" :key="item.Term">
        <span>{{ item.Term }}:</span>
        <span>{{ item.Definition }}</span>
      </li>
    </ul>
  </div>
</div>

demo

Answer 2

Create a computed property that organizes the fields alphabetically by letter (using Array.prototype.reduce() on this.fields[]):

new Vue({
  computed: {
    fieldsByLetter() {
      const groups = this.fields.reduce((previous, current) => {
        const letter = current.Term.charAt(0).toUpperCase(); // using uppercase first letter
        previous[letter] ??= []; // create an array for this letter if it doesn't exist
        previous[letter].push(current); // add current field to the array
        return previous; // return updated object
      }, {});

      // sort fields by Term alphabetically
      Object.values(groups).forEach(fields => fields.sort((a, b) => a.Term.localeCompare(b.Term)));

      return groups;
    }
  },
})

Next, loop through the computed object with v-for, display the fields[] of the object using its own v-for, and each item in a <li> element to achieve the desired output:

<div id="app" class="container">
  <div v-for="(fields, letter) in fieldsByLetter" :key="letter">
    <h3>{{ letter }}</h3>
    <ul>
      <li v-for="item in fields" :key="item.Term">
        <span>{{ item.Term }}:</span>
        <span>{{ item.Definition }}</span>
      </li>
    </ul>
  </div>
</div>

demo

Answer 3

Answer №2

This solution takes a direct approach by harnessing the capabilities of lodash to tackle the issue effectively.

To get started, make sure to import the lodash library at the beginning of your script; this tool is well-known for its data manipulation functionalities.

import * as _ from "https://cdn.skypack.dev/<a href="/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="4824272c293b20087c66797f">[email protected]</a>";

Then, insert the following code snippet:

methods: {
    sorting(item) {
      return _.mapValues(
        _.groupBy(item, function (e) {
          return e.Term;
        })
      );
    },
  },
computed: {
    terms() {
      return this.sorting(this.fields);
    },
}

In this section, I've created a computed variable that manipulates the fields variable using the sorting function from lodash. The values are mapped and grouped based on the Term field within the array.

Lastly, ensure to adjust the structure of the HTML code accordingly:

<div id="app" class="container">
  <div v-for="(term, key, index) in terms" :key="index"> 
   <h4>{{ key.charAt(0) }}</h4> 
   <ul> 
     <li v-for="item in fields" :key="item.Term">
       <span>{{ item.Term }}:</span>
       <span>{{ item.Definition }}</span>
     </li&rt;
   </ul&rt;
>;
</div>;

For additional reference, you can view the Codepen demo here: https://codepen.io/auliaamir/pen/GROVJvr

Answer 4

This solution takes a direct approach by harnessing the capabilities of lodash to tackle the issue effectively.

To get started, make sure to import the lodash library at the beginning of your script; this tool is well-known for its data manipulation functionalities.

import * as _ from "https://cdn.skypack.dev/<a href="/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="4824272c293b20087c66797f">[email protected]</a>";

Then, insert the following code snippet:

methods: {
    sorting(item) {
      return _.mapValues(
        _.groupBy(item, function (e) {
          return e.Term;
        })
      );
    },
  },
computed: {
    terms() {
      return this.sorting(this.fields);
    },
}

In this section, I've created a computed variable that manipulates the fields variable using the sorting function from lodash. The values are mapped and grouped based on the Term field within the array.

Lastly, ensure to adjust the structure of the HTML code accordingly:

<div id="app" class="container">
  <div v-for="(term, key, index) in terms" :key="index"> 
   <h4>{{ key.charAt(0) }}</h4> 
   <ul> 
     <li v-for="item in fields" :key="item.Term">
       <span>{{ item.Term }}:</span>
       <span>{{ item.Definition }}</span>
     </li&rt;
   </ul&rt;
>;
</div>;

For additional reference, you can view the Codepen demo here: https://codepen.io/auliaamir/pen/GROVJvr

What is the best method for iterating through an array and generating a glossary list organized by categories?

Answer №1

Answer №2

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