lodash/lodash.unset/index.js

/**
 * lodash (Custom Build) <https://lodash.com/>
 * Build: `lodash modularize exports="npm" -o ./`
 * Copyright jQuery Foundation and other contributors <https://jquery.org/>
 * Released under MIT license <https://lodash.com/license>
 * Based on Underscore.js 1.8.3 <http://underscorejs.org/LICENSE>
 * Copyright Jeremy Ashkenas, DocumentCloud and Investigative Reporters & Editors
 */
var baseSlice = require('lodash._baseslice'),
    stringToPath = require('lodash._stringtopath');

/** Used as references for various `Number` constants. */
var INFINITY = 1 / 0;

/** `Object#toString` result references. */
var symbolTag = '[object Symbol]';

/** Used to match property names within property paths. */
var reIsDeepProp = /\.|\[(?:[^[\]]*|(["'])(?:(?!\1)[^\\]|\\.)*?\1)\]/,
    reIsPlainProp = /^\w*$/;

/** Used for built-in method references. */
var objectProto = Object.prototype;

/** Used to check objects for own properties. */
var hasOwnProperty = objectProto.hasOwnProperty;

/**
 * Used to resolve the
 * [`toStringTag`](http://ecma-international.org/ecma-262/6.0/#sec-object.prototype.tostring)
 * of values.
 */
var objectToString = objectProto.toString;

/* Built-in method references for those with the same name as other `lodash` methods. */
var nativeGetPrototype = Object.getPrototypeOf;

/**
 * The base implementation of `_.get` without support for default values.
 *
 * @private
 * @param {Object} object The object to query.
 * @param {Array|string} path The path of the property to get.
 * @returns {*} Returns the resolved value.
 */
function baseGet(object, path) {
  path = isKey(path, object) ? [path] : castPath(path);

  var index = 0,
      length = path.length;

  while (object != null && index < length) {
    object = object[toKey(path[index++])];
  }
  return (index && index == length) ? object : undefined;
}

/**
 * The base implementation of `_.has` without support for deep paths.
 *
 * @private
 * @param {Object} object The object to query.
 * @param {Array|string} key The key to check.
 * @returns {boolean} Returns `true` if `key` exists, else `false`.
 */
function baseHas(object, key) {
  // Avoid a bug in IE 10-11 where objects with a [[Prototype]] of `null`,
  // that are composed entirely of index properties, return `false` for
  // `hasOwnProperty` checks of them.
  return hasOwnProperty.call(object, key) ||
    (typeof object == 'object' && key in object && getPrototype(object) === null);
}

/**
 * The base implementation of `_.unset`.
 *
 * @private
 * @param {Object} object The object to modify.
 * @param {Array|string} path The path of the property to unset.
 * @returns {boolean} Returns `true` if the property is deleted, else `false`.
 */
function baseUnset(object, path) {
  path = isKey(path, object) ? [path] : castPath(path);
  object = parent(object, path);

  var key = toKey(last(path));
  return !(object != null && baseHas(object, key)) || delete object[key];
}

/**
 * Casts `value` to a path array if it's not one.
 *
 * @private
 * @param {*} value The value to inspect.
 * @returns {Array} Returns the cast property path array.
 */
function castPath(value) {
  return isArray(value) ? value : stringToPath(value);
}

/**
 * Gets the `[[Prototype]]` of `value`.
 *
 * @private
 * @param {*} value The value to query.
 * @returns {null|Object} Returns the `[[Prototype]]`.
 */
function getPrototype(value) {
  return nativeGetPrototype(Object(value));
}

/**
 * Checks if `value` is a property name and not a property path.
 *
 * @private
 * @param {*} value The value to check.
 * @param {Object} [object] The object to query keys on.
 * @returns {boolean} Returns `true` if `value` is a property name, else `false`.
 */
function isKey(value, object) {
  if (isArray(value)) {
    return false;
  }
  var type = typeof value;
  if (type == 'number' || type == 'symbol' || type == 'boolean' ||
      value == null || isSymbol(value)) {
    return true;
  }
  return reIsPlainProp.test(value) || !reIsDeepProp.test(value) ||
    (object != null && value in Object(object));
}

/**
 * Gets the parent value at `path` of `object`.
 *
 * @private
 * @param {Object} object The object to query.
 * @param {Array} path The path to get the parent value of.
 * @returns {*} Returns the parent value.
 */
function parent(object, path) {
  return path.length == 1 ? object : baseGet(object, baseSlice(path, 0, -1));
}

/**
 * Converts `value` to a string key if it's not a string or symbol.
 *
 * @private
 * @param {*} value The value to inspect.
 * @returns {string|symbol} Returns the key.
 */
function toKey(value) {
  if (typeof value == 'string' || isSymbol(value)) {
    return value;
  }
  var result = (value + '');
  return (result == '0' && (1 / value) == -INFINITY) ? '-0' : result;
}

/**
 * Gets the last element of `array`.
 *
 * @static
 * @memberOf _
 * @since 0.1.0
 * @category Array
 * @param {Array} array The array to query.
 * @returns {*} Returns the last element of `array`.
 * @example
 *
 * _.last([1, 2, 3]);
 * // => 3
 */
function last(array) {
  var length = array ? array.length : 0;
  return length ? array[length - 1] : undefined;
}

/**
 * Checks if `value` is classified as an `Array` object.
 *
 * @static
 * @memberOf _
 * @since 0.1.0
 * @type {Function}
 * @category Lang
 * @param {*} value The value to check.
 * @returns {boolean} Returns `true` if `value` is correctly classified,
 *  else `false`.
 * @example
 *
 * _.isArray([1, 2, 3]);
 * // => true
 *
 * _.isArray(document.body.children);
 * // => false
 *
 * _.isArray('abc');
 * // => false
 *
 * _.isArray(_.noop);
 * // => false
 */
var isArray = Array.isArray;

/**
 * Checks if `value` is object-like. A value is object-like if it's not `null`
 * and has a `typeof` result of "object".
 *
 * @static
 * @memberOf _
 * @since 4.0.0
 * @category Lang
 * @param {*} value The value to check.
 * @returns {boolean} Returns `true` if `value` is object-like, else `false`.
 * @example
 *
 * _.isObjectLike({});
 * // => true
 *
 * _.isObjectLike([1, 2, 3]);
 * // => true
 *
 * _.isObjectLike(_.noop);
 * // => false
 *
 * _.isObjectLike(null);
 * // => false
 */
function isObjectLike(value) {
  return !!value && typeof value == 'object';
}

/**
 * Checks if `value` is classified as a `Symbol` primitive or object.
 *
 * @static
 * @memberOf _
 * @since 4.0.0
 * @category Lang
 * @param {*} value The value to check.
 * @returns {boolean} Returns `true` if `value` is correctly classified,
 *  else `false`.
 * @example
 *
 * _.isSymbol(Symbol.iterator);
 * // => true
 *
 * _.isSymbol('abc');
 * // => false
 */
function isSymbol(value) {
  return typeof value == 'symbol' ||
    (isObjectLike(value) && objectToString.call(value) == symbolTag);
}

/**
 * Removes the property at `path` of `object`.
 *
 * **Note:** This method mutates `object`.
 *
 * @static
 * @memberOf _
 * @since 4.0.0
 * @category Object
 * @param {Object} object The object to modify.
 * @param {Array|string} path The path of the property to unset.
 * @returns {boolean} Returns `true` if the property is deleted, else `false`.
 * @example
 *
 * var object = { 'a': [{ 'b': { 'c': 7 } }] };
 * _.unset(object, 'a[0].b.c');
 * // => true
 *
 * console.log(object);
 * // => { 'a': [{ 'b': {} }] };
 *
 * _.unset(object, ['a', '0', 'b', 'c']);
 * // => true
 *
 * console.log(object);
 * // => { 'a': [{ 'b': {} }] };
 */
function unset(object, path) {
  return object == null ? true : baseUnset(object, path);
}

module.exports = unset;