Check if an object exists within an array

Question

I have the following array, myArray and object, myObject . Is there a way I can determine if myObject exists within myArray ?

const myArray = [ { id: 1, lastName: "Garland", firstName: "Darius", email: "test@example.com" },
                  { id: 2, lastName: "Sexton", firstName: "Collin", email: "fake@example.com"  } ]

const myObject = { lastName: "Sexton", email: "fake@example.com" }

Answer 1

You can make use of some with every to get the desired output.

 const myArray = [ { id: 1, lastName: "Garland", firstName: "Darius", email: "test@example.com" }, { id: 2, lastName: "Sexton", firstName: "Collin", email: "fake@example.com" } ]; const myObject = { lastName: "Sexton", email: "fake@example.com" }; const result = myArray.some(k=>Object.entries(myObject).every(([key,v])=>k[key]===v)); const result2 = myArray.some(k=>Object.entries(k).every(([key,v])=>myObject[key]===v)); console.log(result); console.log(result2);

Answer 2

same as gorak but done with explicit generics functions

 const objPartsExistInArr = (obj,arr) => arr.some(o=>Object.entries(obj).every(([k,v])=>o[k]===v)) const fullObjExistInArr = (obj,arr) => arr.some(o=>Object.entries(o).every(([k,v])=>obj[k]===v)) const myArray = [ { id: 1, lastName: 'Garland', firstName: 'Darius', email: 'test@example.com' }, { id: 2, lastName: 'Sexton', firstName: 'Collin', email: 'fake@example.com' } ] const myObjP = { lastName: 'Sexton', email: 'fake@example.com' } const myObjF = { id: 2, lastName: 'Sexton', firstName: 'Collin', email: 'fake@example.com' } console.log('objPartsExistInArr ->', objPartsExistInArr( myObjP, myArray ) ) console.log('fullObjExistInArr ->', fullObjExistInArr( myObjF, myArray ) )

Answer 3

Use the "indexOf" method of the array. This returns "-1" if if the desired element is not found: You can also use the "includes" method of the array like this:

 var nums=[1, 2] console.log(nums.includes(1));//returns true