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Finding items with a specific property in array, then counting how many, then creating new array with objects of respective result – SEO

I have an array of questions (like quizzes), this is the structure: 

import {SeoCategories} from "../enums/seo";

const initialQuestions = [
    {
        question: "What is Pogo Sticking?",
        category: SeoCategories.analytics,
        options: [
            {
                choice: "The act of visiting a website, then quickly leaving it",
                isCorrect: true,
                explanation: "This is incorrect due to ...",
            },
            {
                choice: "An SEO Tool",
                isCorrect: false,
                explanation: "This is incorrect due to ..."
            },
            {
                choice: "A way of Working",
                isCorrect: false,
                explanation: "This is incorrect due to ..."
            },
            {
                choice: "A website that is down",
                isCorrect: false,
                explanation: "This is incorrect due to ..."
            }
        ]
    },
    {
        question: "What tool can you use to track SEO of a website?",
        category: SeoCategories.analytics,
        options: [
            {
                choice: "SEO Spider",
                isCorrect: true,
                explanation: "This is incorrect due to ..."
            },
            {
                choice: "Geometrix",
                isCorrect: false,
                explanation: "This is incorrect due to ..."
            },
            {
                choice: "Pingdom",
                isCorrect: false,
                explanation: "This is incorrect due to ..."
            },
            {
                choice: "Javascript",
                isCorrect: false,
                explanation: "This is incorrect due to ..."
            }
        ]
    },
    {
        question: "What do you mean by Backlink?",
        category: SeoCategories.analytics,
        options: [
            {
                choice: "Incoming Links",
                isCorrect: true,
                explanation: "The incoming links to your website or webpage are referred to as Backlink. It is also called as an inbound link."
            },
            {
                choice: "Option 2",
                isCorrect: false,
                explanation: "This is incorrect due to ..."
            },
            {
                choice: "Option 3",
                isCorrect: false,
                explanation: "This is incorrect due to ..."
            },
            {
                choice: "Option 4",
                isCorrect: false,
                explanation: "This is incorrect due to ..."
            }
        ]
    },
    {
        question: "What is the main purpose of using keyword in SEO?",
        category: SeoCategories.tools,
        options: [
            {
                choice: "Keywords are used by search engines to populate the subjects over the internet",
                isCorrect: true,
                explanation: "Search engine stores keywords in the database, and when a search is done, it will come up with the best possible match."
            },
            {
                choice: "Option 2",
                isCorrect: false,
                explanation: "This is incorrect due to ..."
            },
            {
                choice: "Option 3",
                isCorrect: false,
                explanation: "This is incorrect due to ..."
            },
            {
                choice: "Option 4",
                isCorrect: false,
                explanation: "This is incorrect due to ..."

            }
        ]
    },
    {
        question: "What is keyword stemming?",
        category: SeoCategories.tools,
        options: [
            {
                choice: "The process of finding out new keywords",
                isCorrect: true,
                explanation: "TThe process of finding out new keywords from the root keyword from the search query is referred to as keywords stemming. Adding a prefix, suffix, or pluralization can be used to create the new keyword."
            },
            {
                choice: "Option 2",
                isCorrect: false,
                explanation: "This is incorrect due to ..."
            },
            {
                choice: "Option 3",
                isCorrect: false,
                explanation: "This is incorrect due to ..."
            },
            {
                choice: "Option 4",
                isCorrect: false,
                explanation: "This is incorrect due to ..."
            }
        ]
    }
];

As we can see, we have 5 questions in this array. 3 of these questions have the category of Analytics and then other 2 questions have the category of Tools.

Analytics = 3 out of 5.
Tools = 2 out of 5.

What I want, is to go through this array of questions, and create a new array (or object), that is something like this: ["Analytics": 3, "Tools": 2] So i can loop through can check the respective category vs total amount of questions, 5.

I am unsure of how to do this. Thank you for your time!

Tags:

2

Answers


  1. 0

    You can use reduce on the array and build a new object with those keys/totals.

    (I added the SeoCategories object because that was missing from your question).

    const SeoCategories = {
  analytics: 'Analytics',
  tools: 'Tools'
}

const initialQuestions = [{
    question: "What is Pogo Sticking?",
    category: SeoCategories.analytics,
    options: [{
        choice: "The act of visiting a website, then quickly leaving it",
        isCorrect: true,
        explanation: "This is incorrect due to ...",
      },
      {
        choice: "An SEO Tool",
        isCorrect: false,
        explanation: "This is incorrect due to ..."
      },
      {
        choice: "A way of Working",
        isCorrect: false,
        explanation: "This is incorrect due to ..."
      },
      {
        choice: "A website that is down",
        isCorrect: false,
        explanation: "This is incorrect due to ..."
      }
    ]
  },
  {
    question: "What tool can you use to track SEO of a website?",
    category: SeoCategories.analytics,
    options: [{
        choice: "SEO Spider",
        isCorrect: true,
        explanation: "This is incorrect due to ..."
      },
      {
        choice: "Geometrix",
        isCorrect: false,
        explanation: "This is incorrect due to ..."
      },
      {
        choice: "Pingdom",
        isCorrect: false,
        explanation: "This is incorrect due to ..."
      },
      {
        choice: "Javascript",
        isCorrect: false,
        explanation: "This is incorrect due to ..."
      }
    ]
  },
  {
    question: "What do you mean by Backlink?",
    category: SeoCategories.analytics,
    options: [{
        choice: "Incoming Links",
        isCorrect: true,
        explanation: "The incoming links to your website or webpage are referred to as Backlink. It is also called as an inbound link."
      },
      {
        choice: "Option 2",
        isCorrect: false,
        explanation: "This is incorrect due to ..."
      },
      {
        choice: "Option 3",
        isCorrect: false,
        explanation: "This is incorrect due to ..."
      },
      {
        choice: "Option 4",
        isCorrect: false,
        explanation: "This is incorrect due to ..."
      }
    ]
  },
  {
    question: "What is the main purpose of using keyword in SEO?",
    category: SeoCategories.tools,
    options: [{
        choice: "Keywords are used by search engines to populate the subjects over the internet",
        isCorrect: true,
        explanation: "Search engine stores keywords in the database, and when a search is done, it will come up with the best possible match."
      },
      {
        choice: "Option 2",
        isCorrect: false,
        explanation: "This is incorrect due to ..."
      },
      {
        choice: "Option 3",
        isCorrect: false,
        explanation: "This is incorrect due to ..."
      },
      {
        choice: "Option 4",
        isCorrect: false,
        explanation: "This is incorrect due to ..."

      }
    ]
  },
  {
    question: "What is keyword stemming?",
    category: SeoCategories.tools,
    options: [{
        choice: "The process of finding out new keywords",
        isCorrect: true,
        explanation: "TThe process of finding out new keywords from the root keyword from the search query is referred to as keywords stemming. Adding a prefix, suffix, or pluralization can be used to create the new keyword."
      },
      {
        choice: "Option 2",
        isCorrect: false,
        explanation: "This is incorrect due to ..."
      },
      {
        choice: "Option 3",
        isCorrect: false,
        explanation: "This is incorrect due to ..."
      },
      {
        choice: "Option 4",
        isCorrect: false,
        explanation: "This is incorrect due to ..."
      }
    ]
  }
];

// Iterate over the array
const out = initialQuestions.reduce((acc, c) => {

  // Destructure the category from the current answer
  // in the iteration
  const { category } = c;

  // If the category doesn't exist on the accumulator object
  // assign it zero, and then add one, otherwise just add one
  acc[category] = (acc[category] || 0) + 1;

  // Return the accumulator for the next iteration
  return acc;
}, {});

console.log(out);
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  2. 0

    This should make the task:

    initialQuestions.reduce((a,b) => {a[b.category]? a[b.category]++:(a[b.category] = 1);return a}, {});
console.log(res);

    const SeoCategories = {analytics: "Analitics", tools: "tools"};
const initialQuestions = [
    {
        question: "What is Pogo Sticking?",
        category: SeoCategories.analytics,
        options: [
            {
                choice: "The act of visiting a website, then quickly leaving it",
                isCorrect: true,
                explanation: "This is incorrect due to ...",
            },
            {
                choice: "An SEO Tool",
                isCorrect: false,
                explanation: "This is incorrect due to ..."
            },
            {
                choice: "A way of Working",
                isCorrect: false,
                explanation: "This is incorrect due to ..."
            },
            {
                choice: "A website that is down",
                isCorrect: false,
                explanation: "This is incorrect due to ..."
            }
        ]
    },
    {
        question: "What tool can you use to track SEO of a website?",
        category: SeoCategories.analytics,
        options: [
            {
                choice: "SEO Spider",
                isCorrect: true,
                explanation: "This is incorrect due to ..."
            },
            {
                choice: "Geometrix",
                isCorrect: false,
                explanation: "This is incorrect due to ..."
            },
            {
                choice: "Pingdom",
                isCorrect: false,
                explanation: "This is incorrect due to ..."
            },
            {
                choice: "Javascript",
                isCorrect: false,
                explanation: "This is incorrect due to ..."
            }
        ]
    },
    {
        question: "What do you mean by Backlink?",
        category: SeoCategories.analytics,
        options: [
            {
                choice: "Incoming Links",
                isCorrect: true,
                explanation: "The incoming links to your website or webpage are referred to as Backlink. It is also called as an inbound link."
            },
            {
                choice: "Option 2",
                isCorrect: false,
                explanation: "This is incorrect due to ..."
            },
            {
                choice: "Option 3",
                isCorrect: false,
                explanation: "This is incorrect due to ..."
            },
            {
                choice: "Option 4",
                isCorrect: false,
                explanation: "This is incorrect due to ..."
            }
        ]
    },
    {
        question: "What is the main purpose of using keyword in SEO?",
        category: SeoCategories.tools,
        options: [
            {
                choice: "Keywords are used by search engines to populate the subjects over the internet",
                isCorrect: true,
                explanation: "Search engine stores keywords in the database, and when a search is done, it will come up with the best possible match."
            },
            {
                choice: "Option 2",
                isCorrect: false,
                explanation: "This is incorrect due to ..."
            },
            {
                choice: "Option 3",
                isCorrect: false,
                explanation: "This is incorrect due to ..."
            },
            {
                choice: "Option 4",
                isCorrect: false,
                explanation: "This is incorrect due to ..."

            }
        ]
    },
    {
        question: "What is keyword stemming?",
        category: SeoCategories.tools,
        options: [
            {
                choice: "The process of finding out new keywords",
                isCorrect: true,
                explanation: "TThe process of finding out new keywords from the root keyword from the search query is referred to as keywords stemming. Adding a prefix, suffix, or pluralization can be used to create the new keyword."
            },
            {
                choice: "Option 2",
                isCorrect: false,
                explanation: "This is incorrect due to ..."
            },
            {
                choice: "Option 3",
                isCorrect: false,
                explanation: "This is incorrect due to ..."
            },
            {
                choice: "Option 4",
                isCorrect: false,
                explanation: "This is incorrect due to ..."
            }
        ]
    }
];
const res = initialQuestions.reduce((a,b) => {a[b.category]? a[b.category]++:(a[b.category] = 1);return a}, {});
console.log(res);
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