How can I filter out values from an array using another array as a reference in the filter function?
x = [3,4,5];
y = [4,5];
var result = x.filter(customFilter);
function customFilter(element, index, array){
// code here
});
What is the most effective method to pass the array "y" as the argument for the "arrayReference" parameter in the function?
If you want to specify a certain "useful" value for the this parameter in the .filter(callback[, thisArg]) method, you can utilize the second argument.
function filterByArray(element, index, array) {
return this.lookup.indexOf(element) > -1; // this.lookup == y
};
var x = [1,2,3],
y = [2,3];
var result = x.filter(filterByArray, {lookup: y});
console.log(result);
If you're unable to modify the callback signature, a workaround is to create a separate class that accepts the other array as a parameter:
function ArrayFilter(otherArray) {
this.otherArray = otherArray;
}
ArrayFilter.prototype.filterByArray = function(element, index, array) {
// Access the other array using this.otherArray
};
Then implement it like this:
x = [1,2,3];
y = [2,3];
var arrayFilter = new ArrayFilter(y);
var filteredArray = x.filter(arrayFilter.filterByArray);
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