I want to compare 2 Arrays of Objects to find the object or objects which is not matched.
In the example below it should output {label: 'Addition', type: 'address', name: 'address_4', defaultValue: 'test'} as this Object is not matched.
const A = [{
label: 'Street Name',
type: 'address',
name: 'address_1',
defaultValue: 'test1'
},
{
label: 'House Number',
type: 'address',
name: 'address_2',
defaultValue: '1563l1'
},
{
label: 'Addition',
type: 'address',
name: 'address_3',
defaultValue: 'ABC684'
}
]
const B = [{
label: 'Street Name',
type: 'address',
name: 'address_1',
defaultValue: 'test1'
},
{
label: 'House Number',
type: 'address',
name: 'address_2',
defaultValue: '1563l1'
},
{
label: 'Addition',
type: 'address',
name: 'address_3',
defaultValue: 'ABC684'
},
{
label: 'Addition',
type: 'address',
name: 'address_4',
defaultValue: 'test'
}
]
const newSet = A;
const currentSet = B;
let difference = currentSet.filter((page1) => !newSet.find(page2 => page1.name === page2.name))
console.log(difference);This does not work. It outputs an empty Array. What I'm doing wrong?
You might by comparing A with B which returns an empty array because there is no element in A which doesn't exist in B instead you should compare B with A.
Below code will return an empty array
const A = [
{
label: "Street Name",
type: "address",
name: "address_1",
defaultValue: "test1",
},
{
label: "House Number",
type: "address",
name: "address_2",
defaultValue: "1563l1",
},
{
label: "Addition",
type: "address",
name: "address_3",
defaultValue: "ABC684",
},
];
const B = [
{
label: "Street Name",
type: "address",
name: "address_1",
defaultValue: "test1",
},
{
label: "House Number",
type: "address",
name: "address_2",
defaultValue: "1563l1",
},
{
label: "Addition",
type: "address",
name: "address_3",
defaultValue: "ABC684",
},
{
label: "Addition",
type: "address",
name: "address_4",
defaultValue: "test",
},
];
let difference = A.filter((page1) => {
const result = B.find((page2) => page1.name === page2.name);
return !result;
});
console.log(difference);You should compare B with A as:
const A = [
{
label: "Street Name",
type: "address",
name: "address_1",
defaultValue: "test1",
},
{
label: "House Number",
type: "address",
name: "address_2",
defaultValue: "1563l1",
},
{
label: "Addition",
type: "address",
name: "address_3",
defaultValue: "ABC684",
},
];
const B = [
{
label: "Street Name",
type: "address",
name: "address_1",
defaultValue: "test1",
},
{
label: "House Number",
type: "address",
name: "address_2",
defaultValue: "1563l1",
},
{
label: "Addition",
type: "address",
name: "address_3",
defaultValue: "ABC684",
},
{
label: "Addition",
type: "address",
name: "address_4",
defaultValue: "test",
},
];
let difference = B.filter((page1) => {
const result = A.find((page2) => page1.name === page2.name);
return !result;
});
console.log(difference);If there is a case where you want to get the difference between two array then you can do as:
const [small, large] = A.length < B.length ? [A, B] : [B, A];
let difference = large.filter((page1) => {
const result = small.find((page2) => page1.name === page2.name);
return !result;
});