keys_.keys(object) Retrieve all the names of the object's own enumerable properties. _.keys({one: 1, two: 2, three: 3}); => ["one", "two", "three"]

times_.times(n, iteratee, [context]) Invokes the given iteratee function n times. Each invocation of iteratee is called with an index argument. Produces an array of the returned values. Note: this example uses the object-oriented syntax. _(3).times(function(n){ genie.grantWishNumber(n); });

size_.size(list) Return the number of values in the list. _.size({one: 1, two: 2, three: 3}); => 3

chain_.chain(obj) Returns a wrapped object. Calling methods on this object will continue to return wrapped objects until value is called. var stooges = [{name: 'curly', age: 25}, {name: 'moe', age: 21}, {name: 'larry', age: 23}]; var youngest = _.chain(stooges) .sortBy(function(stooge){ return stooge.age; }) .map(function(stooge){ return stooge.name + ' is ' + stooge.age; }) .first() .value(); => "moe is 21"

delay_.delay(function, wait, *arguments) Much like setTimeout, invokes function after wait milliseconds. If you pass the optional arguments, they will be forwarded on to the function when it is invoked. var log = _.bind(console.log, console); _.delay(log, 1000, 'logged later'); => 'logged later' // Appears after one second.

reduce_.reduce(list, iteratee, [memo], [context]) Aliases: inject, foldl Also known as inject and foldl, reduce boils down a list of values into a single value. Memo is the initial state of the reduction, and each successive step of it should be returned by iteratee. The iteratee is passed four arguments: the memo, then the value and index (or key) of the iteration, and finally a reference to the entire list. If no memo is passed to the initial invocation of reduce, the iteratee is not invo

debounce_.debounce(function, wait, [immediate]) Creates and returns a new debounced version of the passed function which will postpone its execution until after wait milliseconds have elapsed since the last time it was invoked. Useful for implementing behavior that should only happen after the input has stopped arriving. For example: rendering a preview of a Markdown comment, recalculating a layout after the window has stopped being resized, and so on. At the end of the wait interval, the f

range_.range([start], stop, [step]) A function to create flexibly-numbered lists of integers, handy for each and map loops. start, if omitted, defaults to 0; step defaults to 1. Returns a list of integers from start (inclusive) to stop (exclusive), incremented (or decremented) by step, exclusive. Note that ranges that stop before they start are considered to be zero-length instead of negative â if you'd like a negative range, use a negative step. _.range(10); => [0, 1, 2, 3, 4, 5, 6,

uniqueId_.uniqueId([prefix]) Generate a globally-unique id for client-side models or DOM elements that need one. If prefix is passed, the id will be appended to it. _.uniqueId('contact_'); => 'contact_104'

flatten_.flatten(array, [shallow]) Flattens a nested array (the nesting can be to any depth). If you pass shallow, the array will only be flattened a single level. _.flatten([1, [2], [3, [[4]]]]); => [1, 2, 3, 4]; _.flatten([1, [2], [3, [[4]]]], true); => [1, 2, 3, [[4]]];