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Filter array for objects with nested array that contains a specific string

Rory McCrossan
Robin Banks

I am trying to filter a large multi dimensional array, I know I can re build the array but I was wondering if there was a way of me filtering this array based on if the key “d” contains “d3.1”

   const arr = [
        {a:"a1",b:"b1",c:[{d:"d1.1",e:"e1.1"},{d:"d1.2",e:"e1.2"}]},
        {a:"a2",b:"b2",c:[{d:"d2.1",e:"e2.1"},{d:"d2.2",e:"e2.2"}]},
        {a:"a3",b:"b3",c:[{d:"d3.1",e:"e3.1"},{d:"d3.2",e:"e3.2"}]},
        {a:"a4",b:"b4",c:[{d:"d4.1",e:"e4.1"},{d:"d4.2",e:"e4.2"}]},
        {a:"a1",b:"b1",c:[{d:"d1.1",e:"e1.1"},{d:"d3.1",e:"e1.2"}]},
        {a:"a5",b:"b5",c:[{d:"d3.1",e:"e3.1"},{d:"d3.2",e:"e3.2"}]}
    ]

I have tried using .some and .filter but as it’s an object within an array of objects I can’t seem to get it to work.

My required output would be to have all objects where d contains “d3.1” for example:

output:

    [
       {a:"a3",b:"b3",c:[{d:"d3.1",e:"e3.1"},{d:"d3.2",e:"e3.2"}]},
       {a:"a1",b:"b1",c:[{d:"d1.1",e:"e1.1"},{d:"d3.1",e:"e1.2"}]},
       {a:"a5",b:"b5",c:[{d:"d3.1",e:"e3.1"},{d:"d3.2",e:"e3.2"}]}
    ]

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Answer

Here is a quick solution:

const arr = [
            {a:"a1",b:"b1",c:[{d:"d1.1",e:"e1.1"},{d:"d1.2",e:"e1.2"}]},
            {a:"a2",b:"b2",c:[{d:"d2.1",e:"e2.1"},{d:"d2.2",e:"e2.2"}]},
            {a:"a3",b:"b3",c:[{d:"d3.1",e:"e3.1"},{d:"d3.2",e:"e3.2"}]},
            {a:"a4",b:"b4",c:[{d:"d4.1",e:"e4.1"},{d:"d4.2",e:"e4.2"}]},
            {a:"a1",b:"b1",c:[{d:"d1.1",e:"e1.1"},{d:"d3.1",e:"e1.2"}]},
            {a:"a5",b:"b5",c:[{d:"d3.1",e:"e3.1"},{d:"d3.2",e:"e3.2"}]}
    ]
    
    
console.log(arr.filter(el => JSON.stringify(el).includes("d3.1")))