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/**
* lodash 3.1.3 (Custom Build) <https://lodash.com/>
* Build: `lodash modern modularize exports="npm" -o ./`
* Copyright 2012-2015 The Dojo Foundation <http://dojofoundation.org/>
* Based on Underscore.js 1.8.3 <http://underscorejs.org/LICENSE>
* Copyright 2009-2015 Jeremy Ashkenas, DocumentCloud and Investigative Reporters & Editors
* Available under MIT license <https://lodash.com/license>
*/
var isArguments = require('lodash.isarguments'),
isArray = require('lodash.isarray');
/**
* Checks if `value` is object-like.
*
* @private
* @param {*} value The value to check.
* @returns {boolean} Returns `true` if `value` is object-like, else `false`.
*/
function isObjectLike(value) {
return !!value && typeof value == 'object';
}
/**
* Used as the [maximum length](https://people.mozilla.org/~jorendorff/es6-draft.html#sec-number.max_safe_integer)
* of an array-like value.
*/
var MAX_SAFE_INTEGER = 9007199254740991;
/**
* The base implementation of `_.flatten` with added support for restricting
* flattening and specifying the start index.
*
* @private
* @param {Array} array The array to flatten.
* @param {boolean} [isDeep] Specify a deep flatten.
* @param {boolean} [isStrict] Restrict flattening to arrays-like objects.
* @returns {Array} Returns the new flattened array.
*/
function baseFlatten(array, isDeep, isStrict) {
var index = -1,
length = array.length,
resIndex = -1,
result = [];
while (++index < length) {
var value = array[index];
if (isObjectLike(value) && isArrayLike(value) &&
(isStrict || isArray(value) || isArguments(value))) {
if (isDeep) {
// Recursively flatten arrays (susceptible to call stack limits).
value = baseFlatten(value, isDeep, isStrict);
}
var valIndex = -1,
valLength = value.length;
while (++valIndex < valLength) {
result[++resIndex] = value[valIndex];
}
} else if (!isStrict) {
result[++resIndex] = value;
}
}
return result;
}
/**
* The base implementation of `_.property` without support for deep paths.
*
* @private
* @param {string} key The key of the property to get.
* @returns {Function} Returns the new function.
*/
function baseProperty(key) {
return function(object) {
return object == null ? undefined : object[key];
};
}
/**
* Gets the "length" property value of `object`.
*
* **Note:** This function is used to avoid a [JIT bug](https://bugs.webkit.org/show_bug.cgi?id=142792)
* that affects Safari on at least iOS 8.1-8.3 ARM64.
*
* @private
* @param {Object} object The object to query.
* @returns {*} Returns the "length" value.
*/
var getLength = baseProperty('length');
/**
* Checks if `value` is array-like.
*
* @private
* @param {*} value The value to check.
* @returns {boolean} Returns `true` if `value` is array-like, else `false`.
*/
function isArrayLike(value) {
return value != null && isLength(getLength(value));
}
/**
* Checks if `value` is a valid array-like length.
*
* **Note:** This function is based on [`ToLength`](https://people.mozilla.org/~jorendorff/es6-draft.html#sec-tolength).
*
* @private
* @param {*} value The value to check.
* @returns {boolean} Returns `true` if `value` is a valid length, else `false`.
*/
function isLength(value) {
return typeof value == 'number' && value > -1 && value % 1 == 0 && value <= MAX_SAFE_INTEGER;
}
module.exports = baseFlatten;
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