omit.js

var arrayMap = require('../internal/arrayMap'),
    baseDifference = require('../internal/baseDifference'),
    baseFlatten = require('../internal/baseFlatten'),
    bindCallback = require('../internal/bindCallback'),
    keysIn = require('./keysIn'),
    pickByArray = require('../internal/pickByArray'),
    pickByCallback = require('../internal/pickByCallback'),
    restParam = require('../function/restParam');

/**
 * The opposite of `_.pick`; this method creates an object composed of the
 * own and inherited enumerable properties of `object` that are not omitted.
 * Property names may be specified as individual arguments or as arrays of
 * property names. If `predicate` is provided it is invoked for each property
 * of `object` omitting the properties `predicate` returns truthy for. The
 * predicate is bound to `thisArg` and invoked with three arguments:
 * (value, key, object).
 *
 * @static
 * @memberOf _
 * @category Object
 * @param {Object} object The source object.
 * @param {Function|...(string|string[])} [predicate] The function invoked per
 *  iteration or property names to omit, specified as individual property
 *  names or arrays of property names.
 * @param {*} [thisArg] The `this` binding of `predicate`.
 * @returns {Object} Returns the new object.
 * @example
 *
 * var object = { 'user': 'fred', 'age': 40 };
 *
 * _.omit(object, 'age');
 * // => { 'user': 'fred' }
 *
 * _.omit(object, _.isNumber);
 * // => { 'user': 'fred' }
 */
var omit = restParam(function(object, props) {
  if (object == null) {
    return {};
  }
  if (typeof props[0] != 'function') {
    var props = arrayMap(baseFlatten(props), String);
    return pickByArray(object, baseDifference(keysIn(object), props));
  }
  var predicate = bindCallback(props[0], props[1], 3);
  return pickByCallback(object, function(value, key, object) {
    return !predicate(value, key, object);
  });
});

module.exports = omit;