-- text is nil -- we can check length of string if not text or string.len(text) == 0 then print(text,"is empty.") else print(text,"is not empty.") end -- text is empty text = '' if not text or string.len(text) =
First two deal with null value and second two deal with empty string. <xsl:if test="USER/FIRSTNAME"> USERNAME is not null </xsl:if> <xsl:if test="not(USER/FIRSTNAME)"> USERNAME is null </xsl:if> <xsl:if test="USER/FIRSTNAME=''"> USERNAME is empty string </xsl:if> <xsl:if...
String is a data type, which we can use to save the data present in text format. It is a sequence of characters inside the double or single quotes. Sometimes we need to check whether the string is empty or not. In JavaScript, we can check the empty string using the following methods....
If you want to check whether the string is empty/null/undefined, use the following code:let emptyStr; if (!emptyStr) { // String is empty }If the string is empty/null/undefined if condition can return false: Javascript empty string...
在修复Typescript或Javascript中的check null方法时,可以采取以下几种方法: 1. 使用条件语句进行null检查:在代码中使用条件语句,如if语句或三元运算符,来检查变量...
To check if a string is not null and not empty in Java, you can use the length() method of the java.lang.String class to check if the string is empty, and the != operator to check if the string is not null. Here is an example of how you can do this:
The-zoperator returnstrueif a string variable is null or empty. How the use the-zBash Operator Afterdeclaring a string variable, use the-zoperator in anif statementto check whether a string is empty or not: MY_STRING="" if [ -z $MYSTRING ] ...
C# equivalent of JavaScript escape() C# for determining if AM or PM C# has GetDate() function? c# Hashtable getting values by Key name C# Help Assigning a boolean variable based on condition C# how to check char is null or empty c# if condition string length count C# IIF check int ...
Use a Conditional Statement to Check if a String Variable Is Not Null or Empty in PowerShell We have created a string variable,$string. $string="Hello World" The following example checks if a$stringvariable is null or not in PowerShell. It returns the first statement if the variable is ...
In JavaScript, there are various methods available to check if a variable is undefined. Each method has its own use cases and subtle differences. 1. Using typeof Operator The typeof operator can be used to check if a variable is undefined by comparing its type with the string ‘undefined...