FirstOrDefault

Description:

This method is similar to first method , However if no item exists , it does not throw an exception. It returns null.

let items = ['One', 'Two', 'Three', 'Four', 'Five', 'Six', 'Seven', 'Eight', 'Nine', 'Ten'];

let first = items.asEnumerable().firstOrDefault();

console.log(first);

first = empty.asEnumerable().firstOrDefault();
console.log(first);

Description:

You can pass an argument as a predicate. The returned value is the first item of the list that matches that predicate criteria.

Sample:

first = items.asEnumerable().firstOrDefault(item => item.length == 5);

console.log('first item is equals 5 length => ' + first);