twitst4tz

twitter statistics web application
Log | Files | Refs | README | LICENSE

util.js (3021B)

      1 // Copyright Joyent, Inc. and other Node contributors.
      2 //
      3 // Permission is hereby granted, free of charge, to any person obtaining a
      4 // copy of this software and associated documentation files (the
      5 // "Software"), to deal in the Software without restriction, including
      6 // without limitation the rights to use, copy, modify, merge, publish,
      7 // distribute, sublicense, and/or sell copies of the Software, and to permit
      8 // persons to whom the Software is furnished to do so, subject to the
      9 // following conditions:
     10 //
     11 // The above copyright notice and this permission notice shall be included
     12 // in all copies or substantial portions of the Software.
     13 //
     14 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
     15 // OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
     16 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
     17 // NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
     18 // DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
     19 // OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
     20 // USE OR OTHER DEALINGS IN THE SOFTWARE.
     21 
     22 // NOTE: These type checking functions intentionally don't use `instanceof`
     23 // because it is fragile and can be easily faked with `Object.create()`.
     24 
     25 function isArray(arg) {
     26   if (Array.isArray) {
     27     return Array.isArray(arg);
     28   }
     29   return objectToString(arg) === '[object Array]';
     30 }
     31 exports.isArray = isArray;
     32 
     33 function isBoolean(arg) {
     34   return typeof arg === 'boolean';
     35 }
     36 exports.isBoolean = isBoolean;
     37 
     38 function isNull(arg) {
     39   return arg === null;
     40 }
     41 exports.isNull = isNull;
     42 
     43 function isNullOrUndefined(arg) {
     44   return arg == null;
     45 }
     46 exports.isNullOrUndefined = isNullOrUndefined;
     47 
     48 function isNumber(arg) {
     49   return typeof arg === 'number';
     50 }
     51 exports.isNumber = isNumber;
     52 
     53 function isString(arg) {
     54   return typeof arg === 'string';
     55 }
     56 exports.isString = isString;
     57 
     58 function isSymbol(arg) {
     59   return typeof arg === 'symbol';
     60 }
     61 exports.isSymbol = isSymbol;
     62 
     63 function isUndefined(arg) {
     64   return arg === void 0;
     65 }
     66 exports.isUndefined = isUndefined;
     67 
     68 function isRegExp(re) {
     69   return objectToString(re) === '[object RegExp]';
     70 }
     71 exports.isRegExp = isRegExp;
     72 
     73 function isObject(arg) {
     74   return typeof arg === 'object' && arg !== null;
     75 }
     76 exports.isObject = isObject;
     77 
     78 function isDate(d) {
     79   return objectToString(d) === '[object Date]';
     80 }
     81 exports.isDate = isDate;
     82 
     83 function isError(e) {
     84   return (objectToString(e) === '[object Error]' || e instanceof Error);
     85 }
     86 exports.isError = isError;
     87 
     88 function isFunction(arg) {
     89   return typeof arg === 'function';
     90 }
     91 exports.isFunction = isFunction;
     92 
     93 function isPrimitive(arg) {
     94   return arg === null ||
     95          typeof arg === 'boolean' ||
     96          typeof arg === 'number' ||
     97          typeof arg === 'string' ||
     98          typeof arg === 'symbol' ||  // ES6 symbol
     99          typeof arg === 'undefined';
    100 }
    101 exports.isPrimitive = isPrimitive;
    102 
    103 exports.isBuffer = Buffer.isBuffer;
    104 
    105 function objectToString(o) {
    106   return Object.prototype.toString.call(o);
    107 }