Equivalent to LINQ's Enumerable.First(predicate)

No need to reinvent the wheel, the correct way to do it is to use .find:

var firstMatch = ['a', 'b', 'c'].find(applyConditions);

If you're using a browser that does not support .find you can polyfill it

You could emulate this in the case where you want to return the first truthy value with reduce.

['a', 'b', 'c'].reduce(function(prev, curr) { 
    return prev || predicate(curr) && curr; 
}, false);

edit: made more terse with @BenjaminGruenbaum suggestion