Display Duplicate values with count using reduce in Javascript

    const users = [
        { name: 'John', age: 30, designation: 'Developer' },
        { name: 'Wilson', age: 26, designation: 'Designer' },
        { name: 'Riya', age: 45, designation: 'Business analyst' },
        { name: 'John', age: 30, designation: 'Developer' },
        { name: 'Sandeep', age: 22, designation: 'Tech Lead' },
    ];

    //duplicate_emp = { 30: 1, 26:1, 45:1, 22:1 }

    const output = users.reduce((acc, curr) => {
        if(acc[curr.age]){
            acc[curr.age] = ++acc[curr.age];
        }else{
            acc[curr.age] = 1; 
        }
        return acc;
    }, {});
    console.log(output);

Popularity 7/10 Helpfulness 4/10 Language javascript

Source: Grepper

Tags: count display javascript reduce using

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Contributed on Aug 17 2022

sri teja

0 Answers Avg Quality 2/10

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Display Duplicate values with count using reduce in Javascript

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Display Duplicate values with count using reduce in Javascript

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