check is string
string values are not String objects (which is why the instanceof fails)2. To cover both cases using "type-checking" it would be typeof x === "string" || x instanceof ... , The typeof operator returns a string indicating the type of the unevaluated operand., use typeof doSomething(result) if typeof result is 'string'. Note that typeof is an operator not a function so you don't write typeof(result). You can ...,If you're creating numbers and strings via a constructor, such as var foo = new .... The best way I have found is to either check for a method on the string, i.e.: ,Add("pocode", ViewState["po_txt "]); foreach (string name in conditions.Keys) if ... ToString(), out Val)) //Your Logic for int } else //Your Logic for String } }. ,Object foo = ""; if( foo instanceof String ) // do something String related to foo } ... String myString; if (object instanceof String) myString = (String) object; }. ,On a related note: the above check won't work if a string is created with new String('hello') as the type will be Object instead. There are complicated solutions to ... ,isinstance(s, str). The bytes class isn't considered a string type in Python 3. .... The type module also exists if you are checking more than ints and strings. ,Either function will handle the case DRAX mentioned... that is, they both check if (A) the variable is a string literal or (B) it's an instance of the String object.
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 check is string 相關參考資料
check if an object is string in Javascript - Stack Overflow
string values are not String objects (which is why the instanceof fails)2. To cover both cases using "type-checking" it would be typeof x === "string" || x instanceof ... https://stackoverflow.com typeof | MDN
The typeof operator returns a string indicating the type of the unevaluated operand. https://developer.mozilla.org How to check if variable is String type - Stack Overflow
use typeof doSomething(result) if typeof result is 'string'. Note that typeof is an operator not a function so you don't write typeof(result). You can ... https://stackoverflow.com Check whether variable is number or string in JavaScript - Stack ...
If you're creating numbers and strings via a constructor, such as var foo = new .... The best way I have found is to either check for a method on the string, i.e.: https://stackoverflow.com To check if var is String type - Stack Overflow
Add("pocode", ViewState["po_txt "]); foreach (string name in conditions.Keys) if ... ToString(), out Val)) //Your Logic for int } else //Your Logic for String } }. https://stackoverflow.com How can I know if Object is String type object? - Stack Overflow
Object foo = ""; if( foo instanceof String ) // do something String related to foo } ... String myString; if (object instanceof String) myString = (String) object; }. https://stackoverflow.com How can I check if a var is a string in JavaScript? - Stack Overflow
On a related note: the above check won't work if a string is created with new String('hello') as the type will be Object instead. There are complicated solutions to ... https://stackoverflow.com How to check if type of a variable is string? - Stack Overflow
isinstance(s, str). The bytes class isn't considered a string type in Python 3. .... The type module also exists if you are checking more than ints and strings. https://stackoverflow.com Check if a variable is a string in JavaScript - Stack Overflow
Either function will handle the case DRAX mentioned... that is, they both check if (A) the variable is a string literal or (B) it's an instance of the String object. https://stackoverflow.com |