else / else if review

elseif.js

function each(collection, predicate){
    if (Array.isArray(collection) || typeof collection === 'string'){
        for (var i = 0; i < collection.length; i++){
            predicate(collection[i]);
        }
    } else if(typeof collection === 'object') {
        for (var j in collection){
            predicate(collection[j]);
        }
    } 
}