unique values in array of objects only code example
Example 1: filter array with unique objects javascript
const array =
[
{ "name": "Joe", "age": 17 },
{ "name": "Bob", "age": 17 },
{ "name": "Carl", "age": 35 }
]
const key = 'age';
const arrayUniqueByKey = [...new Map(array.map(item =>
[item[key], item])).values()];
console.log(arrayUniqueByKey);
Example 2: javascript get unique values from array
const myArray = [1,2,3,1,5,8,1,2,9,4];
const unique = [...new Set(myArray)];
const myString = ["a","b","c","a","d","b"];
const uniqueString = [...new Set(myString)];
Example 3: javascript get unique values from key
const unique = [...new Set(array.map(item => item.age))];
Example 4: how to create an array with unique values
import java.util.Random;
public class GenRandArray {
static Random rand = new Random();
public static void fillInt( int[] fillArray ) {
rand.setSeed(System.currentTimeMillis());
for(int i = 0; i < fillArray.length; i++)
{
fillArray[i]= rand.nextInt();
for (int j = 0; j < i; j++)
{
if (fillArray[i] == fillArray[j])
{
i--;
}
}
}
}
}