findLastIndex_.findLastIndex(array, predicate, [context]) Like _.findIndex but iterates the array in reverse, returning the index closest to the end where the predicate truth test passes. var users = [{'id': 1, 'name': 'Bob', 'last': 'Brown'}, {'id': 2, 'name': 'Ted', 'last': 'White'}, {'id': 3, 'name': 'Frank', 'last': 'James'}, {'id': 4, 'name': 'Ted', 'last': 'Jones'}]; _.findLastIndex(users, { name: 'Ted' }); => 3

pick_.pick(object, *keys) Return a copy of the object, filtered to only have values for the whitelisted keys (or array of valid keys). Alternatively accepts a predicate indicating which keys to pick. _.pick({name: 'moe', age: 50, userid: 'moe1'}, 'name', 'age'); => {name: 'moe', age: 50} _.pick({name: 'moe', age: 50, userid: 'moe1'}, function(value, key, object) { return _.isNumber(value); }); => {age: 50}

value_.chain(obj).value() Extracts the value of a wrapped object. _.chain([1, 2, 3]).reverse().value(); => [3, 2, 1]

lastIndexOf_.lastIndexOf(array, value, [fromIndex]) Returns the index of the last occurrence of value in the array, or -1 if value is not present. Pass fromIndex to start your search at a given index. _.lastIndexOf([1, 2, 3, 1, 2, 3], 2); => 4

findIndex_.findIndex(array, predicate, [context]) Similar to _.indexOf, returns the first index where the predicate truth test passes; otherwise returns -1. _.findIndex([4, 6, 8, 12], isPrime); => -1 // not found _.findIndex([4, 6, 7, 12], isPrime); => 2

throttle_.throttle(function, wait, [options]) Creates and returns a new, throttled version of the passed function, that, when invoked repeatedly, will only actually call the original function at most once per every wait milliseconds. Useful for rate-limiting events that occur faster than you can keep up with. By default, throttle will execute the function as soon as you call it for the first time, and, if you call it again any number of times during the wait period, as soon as that period i

isNumber_.isNumber(object) Returns true if object is a Number (including NaN). _.isNumber(8.4 * 5); => true

isNull_.isNull(object) Returns true if the value of object is null. _.isNull(null); => true _.isNull(undefined); => false

difference_.difference(array, *others) Similar to without, but returns the values from array that are not present in the other arrays. _.difference([1, 2, 3, 4, 5], [5, 2, 10]); => [1, 3, 4]

every_.every(list, [predicate], [context]) Alias: all Returns true if all of the values in the list pass the predicate truth test. Short-circuits and stops traversing the list if a false element is found. _.every([2, 4, 5], function(num) { return num % 2 == 0; }); => false