iteratee

_.iteratee(func) # Ⓢ [Ⓣ][1] Ⓝ

Creates a function that invokes func with the arguments of the created

function. If func is a property name, the created function returns the

property value for a given element. If func is an array or object, the

created function returns true for elements that contain the equivalent

source properties, otherwise it returns false.

Since

4.0.0

Arguments

1. func (*): The value to convert to a callback.

Returns

(Function): Returns the callback.

Example

var users = [
  { 'user': 'barney', 'age': 36, 'active': true },
  { 'user': 'fred',   'age': 40, 'active': false }
];

// The `_.matches` iteratee shorthand.
_.filter(_.iteratee({ 'user': 'barney', 'active': true }), users);
// => [{ 'user': 'barney', 'age': 36, 'active': true }]

// The `_.matchesProperty` iteratee shorthand.
_.filter(_.iteratee(['user', 'fred']), users);
// => [{ 'user': 'fred', 'age': 40 }]

// The `_.property` iteratee shorthand.
_.map(_.iteratee('user'), users);
// => ['barney', 'fred']

// Create custom iteratee shorthands.
_.iteratee = _.wrap(function(iteratee, func) {
  return !_.isRegExp(func) ? iteratee(func) : function(string) {
    return func.test(string);
  };
}, _.iteratee);

_.filter(/ef/, ['abc', 'def']);
// => ['def']

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