Suppose, we have an array of objects like this −
const arr = [{name: "Jack", age: "14"},{name: "bob", age: "14"}, {name: "sue", age: "21"}, {name: "Jill", age: "16"}, {name: "Jack", age: "21"}];
We are required to write a JavaScript function that takes in one such array and removes all the objects that have duplicate values for the name.
Therefore, for the above array, the output should be −
const arr = [{name: "Jack", age: "14"},{name: "bob", age: "14"}, {name: "sue", age: "21"}, {name: "Jill", age: "16"}];
Example
Following is the code −
const arr = [ {name: "Jack", age: "14"}, {name: "bob", age: "14"}, {name: "sue", age: "21"}, {name: "Jill", age: "16"}, {name: "Jack", age: "21"} ]; const removeDuplicate = arr => { const appeared = {}; for(let i = 0; i < arr.length; ){ if(!appeared.hasOwnProperty(arr[i].name)){ appeared[arr[i].name] = 1; i++; continue; }; arr.splice(i, 1); }; }; removeDuplicate(arr); console.log(arr);
Output
This will produce the following output in console −
[ { name: 'Jack', age: '14' }, { name: 'bob', age: '14' }, { name: 'sue', age: '21' }, { name: 'Jill', age: '16' } ]