I have an array of objects like below
const arr =
[ { a: '', b: '', arr: [ { label: '2' }, { label: '3' } ] }
, { a: '', b: '', arr: [ { label: '1' }, { label: '2' }, { label: '3' } ] }
, { a: '', b: '', arr: [ { label: '1' }, { label: '3' } ] }
]
I need to filter this array and get the objects in which the arr array has the label value of 2.
ie., expected result :
const arr =
[ { a: '', b: '', arr: [ { label: '2' }, { label: '3' } ] }
, { a: '', b: '', arr: [ { label: '1' }, { label: '2' }, { label: '3' } ] }
]
I have tried something like this:
array.forEach((item) => item.arr.filter(i) => i.label === '2')
how would we get back a filtered array looping through this array which has label values as "2" inside the arr array?
How can I achieve the expected result?
With filter, some and destructuring
const arr =
[ { a: '', b: '', arr: [ { label: '2' }, { label: '3' } ] }
, { a: '', b: '', arr: [ { label: '1' }, { label: '2' }, { label: '3' } ] }
, { a: '', b: '', arr: [ { label: '1' }, { label: '3' } ] }
]
const output = arr.filter(({ arr }) => arr.some(({ label }) => label === '2'));
console.log(output)Like this:
let oldArray = array = [
{
"a":"",
"b":"",
"arr":[
{
"label":"2"
},
{
"label":"3"
}
]
},
{
"a":"",
"b":"",
"arr":[
{
"label":"1"
},
{
"label":"2"
},
{
"label":"3"
}
]
},
{
"a":"",
"b":"",
"arr":[
{
"label":"1"
},
{
"label":"3"
}
]
}
]
let newArray = oldArray.filter(item=>
item.arr && item.arr.filter(inner=> inner.label == "2").length >= 1
)
console.log(newArray)just use Array.some() and Array.splice() methods to remove undesired elements
const arr =
[ { a: '', b: '', arr: [ { label: '2' }, { label: '3' } ] }
, { a: '', b: '', arr: [ { label: '1' }, { label: '2' }, { label: '3' } ] }
, { a: '', b: '', arr: [ { label: '1' }, { label: '3' } ] }
]
for (let i=arr.length; i--;)
{
if (!arr[i].arr.some(x=>x.label==='2'))
arr.splice(i,1)
}
console.log( arr ) .as-console-wrapper {max-height: 100% !important;top: 0;}
.as-console-row::after {display: none !important;}Or Array.filter() and Array.some() methods to create a new array with only desired elements
const arr =
[ { a: '', b: '', arr: [ { label: '2' }, { label: '3' } ] }
, { a: '', b: '', arr: [ { label: '1' }, { label: '2' }, { label: '3' } ] }
, { a: '', b: '', arr: [ { label: '1' }, { label: '3' } ] }
]
const newArr = arr.filter(el => el.arr.some(x=>x.label==='2'))
console.log( newArr ).as-console-wrapper {max-height: 100% !important;top: 0;}
.as-console-row::after {display: none !important;}