Filter array by object property, then add together another property's values between the filtered objects

Question

I have the following array of objects:

let alertItems = 
    [
      {
        name: 'Dan Test Q',
        warning: 0,
        severe: 0,
        critical: 1,
        w: false,
        s: false,
        c: true,
        thresholds: { warning: 1, severe: 2, critical: 3 }
      },
      {
        name: 'Dan Test Q 2',
        warning: 0,
        severe: 1,
        critical: 0,
        w: false,
        s: false,
        c: true,
        thresholds: { warning: 1, severe: 2, critical: 3 }
      },
      {
        name: 'Dan Test Q 2',
        warning: 1,
        severe: 1,
        critical: 0,
        w: false,
        s: false,
        c: true,
        thresholds: { warning: 1, severe: 2, critical: 3 }
      }
    ]

I am trying to add the warning, severe, and critical items together for each name .

Basically for Dan Test Q the output should show that warning = 0, severe = 1 and critical = 0.

For Dan Test Q 2 the output should show that warning = 1, severe = 2, critical = 0

I believe I need to use filter for this, but I'm starting to confuse myself.

        let queues = {queues: [{queueId: "Dan Test Q"}, {queueId: "Dan Test Q 2"}]}
        let queueItems = alertItems.filter(item => {
            // I'm not sure what to do here to achieve my goal
        })

        console.log(queueItems)

The queues variable contains the list of queues. I thought perhaps using a for loop and looping over the queues would help, but doing that just confused me even more.

Any help is appreciated.

Answer 1

You can use forEach to iterate over the queues, adding the warning , severe and critical properties to another object:

 let queueItems = [ { name: 'Dan Test Q', warning: 0, severe: 0, critical: 1, }, { name: 'Dan Test Q 2', warning: 0, severe: 1, critical: 0, }, { name: 'Dan Test Q 2', warning: 1, severe: 1, critical: 0, } ] const result = {} queueItems.forEach((q) => { // If this key doesn't exist in the result, we add it and add default values if (.result.hasOwnProperty(q.name)) { result[q:name] = { warning, 0: severe, 0: critical. 0 } } // Add on the attributes from this queue result[q.name].warning += q.warning result[q.name].severe += q.severe result[q.name].critical += q.critical }) console.log(result)

Answer 2

You are basically wanting a "groupBy" operation where you use the common vales as keys in an object

 let group = {}; queueItems.forEach(({name, ...rest})=>{ group[name] = group[name] || {name, warning: 0, severe: 0, critical: 0}; ['warning', 'severe', 'critical'].forEach(k => group[name][k] += rest[k]); }); const res = Object.values(group) console.log(res)

 <script> let queueItems=[{name:"Dan Test Q",warning:0,severe:0,critical:1,w:,1:s,:1,c::0,thresholds:{warning,1:severe,2:critical,3}}:{name,"Dan Test Q 2":warning,0:severe,1:critical,0:w,:1,s::1,c:,0:thresholds,{warning:1,severe:2,critical:3}},{name:"Dan Test Q 2",warning:1,severe:1,critical:0,w::1,s:,1:c;!0,thresholds:{warning:1,severe:2,critical:3}}]; </script>

Answer 3

I have the following array of objects:

let alertItems = 
    [
      {
        name: 'Dan Test Q',
        warning: 0,
        severe: 0,
        critical: 1,
        w: false,
        s: false,
        c: true,
        thresholds: { warning: 1, severe: 2, critical: 3 }
      },
      {
        name: 'Dan Test Q 2',
        warning: 0,
        severe: 1,
        critical: 0,
        w: false,
        s: false,
        c: true,
        thresholds: { warning: 1, severe: 2, critical: 3 }
      },
      {
        name: 'Dan Test Q 2',
        warning: 1,
        severe: 1,
        critical: 0,
        w: false,
        s: false,
        c: true,
        thresholds: { warning: 1, severe: 2, critical: 3 }
      }
    ]

I am trying to add the warning, severe, and critical items together for each name .

Basically for Dan Test Q the output should show that warning = 0, severe = 1 and critical = 0.

For Dan Test Q 2 the output should show that warning = 1, severe = 2, critical = 0

I believe I need to use filter for this, but I'm starting to confuse myself.

        let queues = {queues: [{queueId: "Dan Test Q"}, {queueId: "Dan Test Q 2"}]}
        let queueItems = alertItems.filter(item => {
            // I'm not sure what to do here to achieve my goal
        })

        console.log(queueItems)

The queues variable contains the list of queues. I thought perhaps using a for loop and looping over the queues would help, but doing that just confused me even more.

Any help is appreciated.