JavaScript: Rebuild Array of Objects using Reduce

Question

I have an array of objects that I'm trying to rebuild without any success:

const data = [
    {
        ID: 1,
        TemplateName: 'Template 1',
        TemplateCategory: 'Category A',
    }, 
    {
        ID: 2,
        TemplateName: 'Template 2',
        TemplateCategory: 'Category A',
    }, 
    {
        ID: 3,
        TemplateName: 'Template 3',
        TemplateCategory: 'Category B',
    }, 
]

I have the below code which produces the following undesired result:

    result = [...data
      .reduce((acc, {TemplateCategory, TemplateName, ID}) => {
          const group = acc.get(TemplateCategory)
          group ? group.options.push(ID, TemplateName) : acc.set(TemplateCategory, {TemplateCategory, "options":[ID, TemplateName]})
          return acc
        }, new Map)
      .values()
    ]

console.log(result) // undesired result:
[
    {
        TemplateCategory: 'Category A',
        options: [1, 'Template 1', 2, 'Template 2']
    },
    {
        TemplateCategory: 'Category B',
        options: [3, 'Template 3']
    }
]

I am stuck on trying to convert options to an Array of Objects with value and label as properties. Also im struggling trying to reword TemplateCategory property to label.

My desired result is:

[
    {
        label: 'Category A',
        options: [
            {
                value: 1,
                label: 'Template 1'
            },
            {
                value: 2,
                label: 'Template 2'
            }
        ]
    },
    {
        label: 'Category B',
        options: [
            {
                value: 3,
                label: 'Template 3'
            }
        ]
    }
]

TIA

ProDec · Accepted Answer · 2021-11-26 01:46:04Z

2

Like this

const data = [
    {
        ID: 1,
        TemplateName: 'Template 1',
        TemplateCategory: 'Category A',
    }, 
    {
        ID: 2,
        TemplateName: 'Template 2',
        TemplateCategory: 'Category A',
    }, 
    {
        ID: 3,
        TemplateName: 'Template 3',
        TemplateCategory: 'Category B',
    }, 
]

const result = [...data
      .reduce((acc, {TemplateCategory, TemplateName, ID}) => {
          const group = acc.get(TemplateCategory)
          group ? group.options.push({value: ID, label: TemplateName}) : acc.set(TemplateCategory, {label: TemplateCategory, "options":[{value: ID, label: TemplateName}]})
          return acc
        }, new Map)
      .values()
    ]

console.log(result) // undesired result:

answered Nov 26, 2021 at 1:46

ProDec

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2 Comments

sda87 Over a year ago

Hello, I have run the code snippet as I required similar output but showing [object] in options Array. please show me where to fix it

ProDec Over a year ago

@sda87 this is not right place to ask a question. You need to post your code, sample data, expected output, where get stuck, etc in your question. And in this particular code snippet, the options array is indeed an array of objects, e.g. typeof {}

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