// Copyright Joyent, Inc. and other Node contributors.
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//
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// Permission is hereby granted, free of charge, to any person obtaining a
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// copy of this software and associated documentation files (the
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// "Software"), to deal in the Software without restriction, including
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// without limitation the rights to use, copy, modify, merge, publish,
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// distribute, sublicense, and/or sell copies of the Software, and to permit
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// persons to whom the Software is furnished to do so, subject to the
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// following conditions:
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//
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// The above copyright notice and this permission notice shall be included
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// in all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
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// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
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// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
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// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
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// USE OR OTHER DEALINGS IN THE SOFTWARE.
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// NOTE: These type checking functions intentionally don't use `instanceof`
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// because it is fragile and can be easily faked with `Object.create()`.
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function isArray(arg) {
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if (Array.isArray) {
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return Array.isArray(arg);
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}
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return objectToString(arg) === '[object Array]';
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}
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exports.isArray = isArray;
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function isBoolean(arg) {
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return typeof arg === 'boolean';
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}
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exports.isBoolean = isBoolean;
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function isNull(arg) {
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return arg === null;
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}
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exports.isNull = isNull;
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function isNullOrUndefined(arg) {
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return arg == null;
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}
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exports.isNullOrUndefined = isNullOrUndefined;
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function isNumber(arg) {
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return typeof arg === 'number';
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}
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exports.isNumber = isNumber;
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function isString(arg) {
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return typeof arg === 'string';
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}
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exports.isString = isString;
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function isSymbol(arg) {
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return typeof arg === 'symbol';
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}
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exports.isSymbol = isSymbol;
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function isUndefined(arg) {
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return arg === void 0;
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}
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exports.isUndefined = isUndefined;
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function isRegExp(re) {
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return objectToString(re) === '[object RegExp]';
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}
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exports.isRegExp = isRegExp;
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function isObject(arg) {
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return typeof arg === 'object' && arg !== null;
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}
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exports.isObject = isObject;
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function isDate(d) {
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return objectToString(d) === '[object Date]';
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}
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exports.isDate = isDate;
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function isError(e) {
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return (objectToString(e) === '[object Error]' || e instanceof Error);
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}
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exports.isError = isError;
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function isFunction(arg) {
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return typeof arg === 'function';
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}
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exports.isFunction = isFunction;
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function isPrimitive(arg) {
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return arg === null ||
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typeof arg === 'boolean' ||
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typeof arg === 'number' ||
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typeof arg === 'string' ||
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typeof arg === 'symbol' || // ES6 symbol
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typeof arg === 'undefined';
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}
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exports.isPrimitive = isPrimitive;
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exports.isBuffer = Buffer.isBuffer;
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function objectToString(o) {
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return Object.prototype.toString.call(o);
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}
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