mirror of
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115 lines
3.8 KiB
JavaScript
115 lines
3.8 KiB
JavaScript
/**
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* lodash 3.0.0 (Custom Build) <https://lodash.com/>
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* Build: `lodash modern modularize exports="npm" -o ./`
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* Copyright 2012-2015 The Dojo Foundation <http://dojofoundation.org/>
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* Based on Underscore.js 1.7.0 <http://underscorejs.org/LICENSE>
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* Copyright 2009-2015 Jeremy Ashkenas, DocumentCloud and Investigative Reporters & Editors
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* Available under MIT license <https://lodash.com/license>
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*/
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/** `Object#toString` result references. */
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var argsTag = '[object Arguments]',
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arrayTag = '[object Array]',
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boolTag = '[object Boolean]',
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dateTag = '[object Date]',
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errorTag = '[object Error]',
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funcTag = '[object Function]',
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mapTag = '[object Map]',
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numberTag = '[object Number]',
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objectTag = '[object Object]',
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regexpTag = '[object RegExp]',
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setTag = '[object Set]',
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stringTag = '[object String]',
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weakMapTag = '[object WeakMap]';
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var arrayBufferTag = '[object ArrayBuffer]',
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float32Tag = '[object Float32Array]',
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float64Tag = '[object Float64Array]',
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int8Tag = '[object Int8Array]',
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int16Tag = '[object Int16Array]',
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int32Tag = '[object Int32Array]',
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uint8Tag = '[object Uint8Array]',
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uint8ClampedTag = '[object Uint8ClampedArray]',
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uint16Tag = '[object Uint16Array]',
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uint32Tag = '[object Uint32Array]';
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/** Used to identify `toStringTag` values of typed arrays. */
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var typedArrayTags = {};
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typedArrayTags[float32Tag] = typedArrayTags[float64Tag] =
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typedArrayTags[int8Tag] = typedArrayTags[int16Tag] =
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typedArrayTags[int32Tag] = typedArrayTags[uint8Tag] =
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typedArrayTags[uint8ClampedTag] = typedArrayTags[uint16Tag] =
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typedArrayTags[uint32Tag] = true;
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typedArrayTags[argsTag] = typedArrayTags[arrayTag] =
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typedArrayTags[arrayBufferTag] = typedArrayTags[boolTag] =
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typedArrayTags[dateTag] = typedArrayTags[errorTag] =
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typedArrayTags[funcTag] = typedArrayTags[mapTag] =
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typedArrayTags[numberTag] = typedArrayTags[objectTag] =
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typedArrayTags[regexpTag] = typedArrayTags[setTag] =
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typedArrayTags[stringTag] = typedArrayTags[weakMapTag] = false;
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/**
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* Checks if `value` is object-like.
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*
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* @private
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* @param {*} value The value to check.
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* @returns {boolean} Returns `true` if `value` is object-like, else `false`.
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*/
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function isObjectLike(value) {
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return (value && typeof value == 'object') || false;
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}
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/** Used for native method references. */
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var objectProto = Object.prototype;
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/**
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* Used to resolve the `toStringTag` of values.
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* See the [ES spec](https://people.mozilla.org/~jorendorff/es6-draft.html#sec-object.prototype.tostring)
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* for more details.
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*/
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var objToString = objectProto.toString;
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/**
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* Used as the maximum length of an array-like value.
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* See the [ES spec](https://people.mozilla.org/~jorendorff/es6-draft.html#sec-number.max_safe_integer)
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* for more details.
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*/
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var MAX_SAFE_INTEGER = Math.pow(2, 53) - 1;
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/**
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* Checks if `value` is a valid array-like length.
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*
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* **Note:** This function is based on ES `ToLength`. See the
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* [ES spec](https://people.mozilla.org/~jorendorff/es6-draft.html#sec-tolength)
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* for more details.
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*
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* @private
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* @param {*} value The value to check.
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* @returns {boolean} Returns `true` if `value` is a valid length, else `false`.
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*/
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function isLength(value) {
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return typeof value == 'number' && value > -1 && value % 1 == 0 && value <= MAX_SAFE_INTEGER;
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}
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/**
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* Checks if `value` is classified as a typed array.
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*
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* @static
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* @memberOf _
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* @category Lang
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* @param {*} value The value to check.
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* @returns {boolean} Returns `true` if `value` is correctly classified, else `false`.
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* @example
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*
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* _.isTypedArray(new Uint8Array);
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* // => true
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*
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* _.isTypedArray([]);
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* // => false
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*/
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function isTypedArray(value) {
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return (isObjectLike(value) && isLength(value.length) && typedArrayTags[objToString.call(value)]) || false;
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}
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module.exports = isTypedArray;
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