I have an array of objects like:
var a = [
{id: 1, name: 'A'},
{id: 2, name: 'B'},
{id: 3, name: 'C'},
{id: 4, name: 'D'}
];
And Ids array which i want to remove from array a :
var removeItem = [1,2];
I want to remove objects from array a by matching its ids, which removeItem array contains. How can i implement with lodash.
I Checked lodash's _.remove method, but this need a specific condition to remove an item from array. But i have list of ids which i want to remove.
As you mentioned you need the _.remove method and the specific condition you mention is whether the removeItem array contains the id of the checked element of the array.
var removeElements = _.remove(a, obj => removeItem.includes(obj.id));
// you only need to assign the result if you want to do something with the removed elements.
// the a variable now holds the remaining array
You have to pass a predicate function to .remove method from lodash.
var final = _.remove(a, obj => removeItem.indexOf(obj.id) > -1);
using indexOf method.
The indexOf() method returns the first index at which a given element can be found in the array, or -1 if it is not present.
You can do it using native javascript using filter method which accepts as parameter a callback function.
var a = [
{id: 1, name: 'A'},
{id: 2, name: 'B'},
{id: 3, name: 'C'},
{id: 4, name: 'D'}
];
var removeItem = [1,2];
a = a.filter(function(item){
return removeItem.indexOf( item.id ) == -1;
});
console.log(a);But filter method just creates a new array by applying a callback function.
From documentation:
The filter() method creates a new array with all elements that pass the test implemented by the provided function.
If you want to modify the original array use splice method.
var a = [
{id: 1, name: 'A'},
{id: 2, name: 'B'},
{id: 3, name: 'C'},
{id: 4, name: 'D'}
];
var removeItem = [1,2];
removeItem.forEach(function(id){
var itemIndex = a.findIndex(i => i.id == id);
a.splice(itemIndex,1);
});
console.log(a);
a.filter( item => removeItem.indexOf( item.id ) == -1 );