diff options
Diffstat (limited to 'node_modules/core-js/modules/es6.function.has-instance.js')
| -rw-r--r-- | node_modules/core-js/modules/es6.function.has-instance.js | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/node_modules/core-js/modules/es6.function.has-instance.js b/node_modules/core-js/modules/es6.function.has-instance.js new file mode 100644 index 000000000..ae294b1f1 --- /dev/null +++ b/node_modules/core-js/modules/es6.function.has-instance.js @@ -0,0 +1,13 @@ +'use strict'; +var isObject = require('./_is-object') + , getPrototypeOf = require('./_object-gpo') + , HAS_INSTANCE = require('./_wks')('hasInstance') + , FunctionProto = Function.prototype; +// 19.2.3.6 Function.prototype[@@hasInstance](V) +if(!(HAS_INSTANCE in FunctionProto))require('./_object-dp').f(FunctionProto, HAS_INSTANCE, {value: function(O){ + if(typeof this != 'function' || !isObject(O))return false; + if(!isObject(this.prototype))return O instanceof this; + // for environment w/o native `@@hasInstance` logic enough `instanceof`, but add this: + while(O = getPrototypeOf(O))if(this.prototype === O)return true; + return false; +}});
\ No newline at end of file |