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