check if duplicates exist in array object

I want to reaturn true/false if there is some duplicates on object array.

arr = [
     { nr:10, name: 'aba' },
     { nr:11, name: 'cba' },
     { nr:10, name: 'aba' }
]

 arr2 = [
         { year:2020, city: 'Aaa' },
         { year:2010, city: 'Bbb' },
         { year:2020, city: 'Aaa' }
    ]

I found many solutions for one value but what if we want to check the whole object. Do I have to do foreach?

 const result: T[] = [];
    for (const item of array) {
        if (!result.includes(item)) {
            result.push(item);
        }
    }
    return result;

you can use JSON.stringify and map and some array methods.

let arr = [
     { nr:10, name: 'aba' },
     { nr:11, name: 'cba' },
     { nr:10, name: 'aba' }

]


 let valuesStringify = arr2.map(x => JSON.stringify(x));

 let duplicate = valuesStringify.some((item, i) => valuesStringify.indexOf(item) !== i)

console.log(duplicate) //true

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