check is string
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. ,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 ... ,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.: ,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 ... ,Object foo = ""; if( foo instanceof String ) // do something String related to foo } ... String myString; if (object instanceof String) myString = (String) object; }. ,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. , 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 ...,Add("pocode", ViewState["po_txt "]); foreach (string name in conditions.Keys) if ... ToString(), out Val)) //Your Logic for int } else //Your Logic for String } }. , The typeof operator returns a string indicating the type of the unevaluated operand.
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 check is string 相關參考資料
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 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 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 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 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 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 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 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 typeof | MDN
The typeof operator returns a string indicating the type of the unevaluated operand. https://developer.mozilla.org |