Underscore.js _.filter()
Underscore.js _.filter() is used to filter elements from a list that match certain condition.
The full function signature is _.filter(list, predicate, [context]).
The second function parameter “predicate” is a function that provides the filter logic.
The following example filters even numbers from an array.
<!DOCTYPE html>
<html>
<head>
<script src="https://cdnjs.cloudflare.com/ajax/libs/underscore.js/1.8.3/underscore.js"></script>
<script type="text/javascript">
var numbers = [1,2,3,4,5,6,7,8,9,10];
var even_numbers = _.filter(numbers,function(n){
return n % 2 == 0;
});
console.log(even_numbers);
</script>
</head>
</html>
Output :
Similarly, following example filters employees whose above is 30 using the _.filter() function and then iterates them using _.each() :
<!DOCTYPE html>
<html>
<head>
<script src="https://cdnjs.cloudflare.com/ajax/libs/underscore.js/1.8.3/underscore.js"></script>
<script type="text/javascript">
var employees = [{name:"Andy", age:21},
{name:"Bob", age:31},
{name:"Charlie", age:41}];
var emp_above30 = _.filter(employees,function(emp){
return emp.age > 30;
});
console.log("Employees above 30 are : ");
_.each(emp_above30,function(emp,index){
console.log(emp.name);
});
</script>
</head>
</html>
Output :
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