I'm trying to compare 2 array of objects together and remove the duplicates. For example...
var array1 = [0, 1, 2, 3, 4, 5, 6];
var array2 = [7, 8, 1, 2, 9, 10];
How can I check the array2 for any element of array1 and if true then remove that from array2 to eliminate the duplication.
The expected result: array 2 = [7, 8, 9, 10]
Any help would be appreciated, thanks
If the array include primitive types you can use indexOf and array#reduce
const array1 = [0, 1, 2, 3, 4, 5, 6]
const array2 = [7, 8, 1, 2, 9, 10]
var result = array2.filter((num) => {
return array1.indexOf(num) === -1;
});
console.log(result);.as-console-wrapper { max-height: 100% !important; top: 0; }In case of an object, you can get the unique values in second array in comparison to first, please use array#reduce and array#some.
const person1 = [{"name":"a", "id":0},{"name":"A", "id":1},{"name":"B", "id":2},{"name":"C", "id":3},{"name":"D", "id":4},{"name":"E", "id":5},{"name":"F", "id":6}]
const person2 = [{"name":"G", "id":7},{"name":"H", "id":8},{"name":"A", "id":1},{"name":"B", "id":2},{"name":"I", "id":9}, {"name":"J", "id":10}]
var unique = person2.reduce((unique, o) => {
let isFound = person1.some((b) => {
return b.id === o.id;
});
if(!isFound)
unique.push(o);
return unique;
},[]);
console.log(unique);.as-console-wrapper { max-height: 100% !important; top: 0; }
just filter second array.
const array1 = [0, 1, 2, 3, 4, 5, 6];
const array2 = [7, 8, 1, 2, 9, 10];
const newArray = array2.filter(i => !array1.includes(i));
console.log(newArray);
You can use do this:
var array1 = [0, 1, 2, 3, 4, 5, 6];
var array2 = [7, 8, 1, 2, 9, 10];
/* run a filter function for every value in array2 and returned the final filtered array */
var array3 = array2.filter(function(currentValue, index, arr){
return (array1.indexOf(currentValue) === -1); /* this will check whether currentValue exists in aray1 or not. */
});
console.log(array3) /* filtered array */
This should deliver what you want. Or another way:
var array1 = [0, 1, 2, 3, 4, 5, 6];
var array2 = [7, 8, 1, 2, 9, 10];
var duplicateRemoved = [];
/* run a function for every value in array2 and collect the unique value in a new array */
array2.forEach(function(currentValue, index, arr){
if (array1.indexOf(currentValue) === -1) {
duplicateRemoved.push(currentValue);
}
});
console.log(duplicateRemoved)
This should work in your situation unless there are some other external factors associated with it.