In my array, I have the following values:
var a = [2,3,4,5,5,4]
I am looking to extract only unique values from this array, like so:
b = [2,3,4,5]
I have attempted to achieve this using
a.filter(function(d){return b.indexOf(d)>-1})
without resorting to a for loop.
Executing this task can be easily accomplished using JavaScript by utilizing the second parameter, referred to as "index," within the filter method:
var numbers = [1, 2, 3, 4, 5, 6];
numbers.filter(function(num, index){ return numbers.indexOf(num) === index });
This particular issue is not specific to Angular. There are various ways to address it, depending on the libraries you are utilizing.
If jQuery is in use:
var uniqueElements = $.unique([2,3,4,5,5,4]);
The resulting array would be:
[2,3,4,5]
If underscore library is being used:
var uniqueElements = _.uniq([2,3,4,5,5,4]);
The output will be the same.
Alternatively, for pure JavaScript implementation:
var unique = [2,3,4,5,5,4].filter(function(elem, index, self) {
return index == self.indexOf(elem);
})
let uniqueItems = items.filter( (element, index, array) => {
return array.indexOf(element) === index;
});
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