Suppose, we have an array of objects like this −
const arr = [ {id:123, value:"value1", name:"Name1"}, {id:124, value:"value2", name:"Name1"}, {id:125, value:"value3", name:"Name2"}, {id:126, value:"value4", name:"Name2"} ];
Note that some of the "name" property in objects within the array are duplicate.
We are required to write a JavaScript function that takes in one such array of objects. The function should then construct a new array of strings that contains only unique "name" property value from the array.
Therefore, the output for the above input should look like this −
const output = ["Name1", "Name2"];
Example
The code for this will be −
const arr = [ {id:123, value:"value1", name:"Name1"}, {id:124, value:"value2", name:"Name1"}, {id:125, value:"value3", name:"Name2"}, {id:126, value:"value4", name:"Name2"} ]; const pickNames = (arr = []) =>{ const res = []; for (let i = arr.length; i−−;){ if (res.indexOf(arr[i].name) < 0) { res.push(arr[i].name); }; } return res; }; console.log(pickNames(arr));
Output
And the output in the console will be −
[ 'Name2', 'Name1' ]