I need an st4 expression to render an element if a string is not empty:
<if(theString)>...<endif> does not work - it seems to only work for arrays.
I've tried if(theString.length > 0) and all kinds of stuff, but it looks like it this only works for variables that are not set or for arrays.
I am iterating over a list and rendering this, so I could have values in the middle that are empty strings that I don't want to render anything at all for.
I've been struggling trying to find the ability to compare strings in a conditional. I want to be able to test for a condition like obj.Name == 'foobar'. Not sure if stringtemplate-4 can do it?
To render if the value is not null you should be able to do the following.
$if(obj.Name)$ $obj.Name$ $endif$ // prints the Name property of obj
But to find the length of a string you can use strlen function.
ie.
// obj.Name = "foobar", prints 'Length of Name is 6'
$if(strlen(obj.Name))$ Length of Name is $strlen(obj.Name)$ $endif$
Here is a helpful list of all the functions:
https://github.com/antlr/stringtemplate4/blob/master/doc/cheatsheet.md
Related
I have a below string array object which has 4 elements. I want to compare the elements of this list to an string and want to check if string is part of this list.
list = ["starter_v2", "professional_q", "custom_v", "basic_t9"]
str = "starter"
if list.include?str #should return true but returning false as it is checking the full string not the substring
Above if condition should return true, however it is returning false.
Can someone suggest me how to fix this, as I am new to ruby and want to compare strings.
For my usecase, in list object I will always have entries with "_" followed by an alphabetic character and I will compare this by string without "_"
Enumerable#include? checks if a given value matches any value in the given enumerable. A substring is not equivalent to a string that contains it, so this check fails.
Instead, you want to check if any string in the array matches your substring. Ruby has handy facilities for this: Enumerable#any? lets you iterate an enumerable, yielding each element to a block, and then will return true if any invocation of the block returns true.
So, you can use:
list.any? {|element| element.include?(str) }
What this will do is check each entry in list to see if str is included in it; once a match is found, it'll stop iterating and return true. If it goes through the entire list without finding a match, it'll return false.
You could also use use element.start_with? if you know that your search string should always match the first part of the string, or you could use a more complex condition which splits each element on underscore and compares the first part, or you could use a regex. The important part is that the block returns true when you want to indicate a match.
Let's take a string var str = "Hello Kotlin". I want to copy first 5 character of str to another variable strHello. I was wondering is there any function of doing this or I have to apply a loop and copy characters one by one.
As Tim commented, there's a substring() method which does exactly this, so you can simply do:
val strHello = str.substring(0, 5)
(The first parameter is the 0-based index of the first character to take; and the second is the index of the character to stop before.)
There are many, many methods available on most of the common types. If you're using an IDE such as IDEA or Eclipse, you should see a list of them pop up after you type str.. (That's one of many good reasons for using an IDE.) Or check the official documentation.
Please use the string.take(n) utility.
More details at
https://kotlinlang.org/api/latest/jvm/stdlib/kotlin.text/take.html
I was using substring in my project, but it gave an exception when the length of the string was smaller than the second index of substring.
val name1 = "This is a very very long name"
// To copy to another string
val name2 = name1.take(5)
println(name1.substring(0..5))
println(name1.substring(0..50)) // Gives EXCEPTION
println(name1.take(5))
println(name1.take(50)) // No EXCEPTION
I am working in an ABAP program and I have a question.
For example in C# when we have a String variable: string name; , and we want this to be filled with some data from a textbox but also add some ohter text.
For example:
string name = "Hello: " + textBox1.text;,
And I want to ask you how can I do this in ABAP ??? How to add text plus the text written from a Parameter type C?
CONCATENATE and the concatenate operator && will do it as answered by Jagger and vwegert. To do it with string expressions, you use the below where name is the screen field or whatever that has the name in it (it doesn't need to be a field-symbol):
greeting = |Hello: { <name> }|.
String expressions are extremely useful as they can be used to build up complex values without declaring extra variables - e.g. they can passed as directly as function module or method parameters without first assigning to a local variable.
You can either use the CONCATENATE keyword or -- in newer releases -- string expressions. Be sure to check the online documentation and sample programs available using the transaction ABAPDOCU, it will save you a ton of seemingly basic questions.
The equivalent operator is &&.
So in your case it would be:
name = 'Hello: ' && textBox1->text.
I have this string:
201057&channelTitle=null_JS
I want to be able to cut out the '201057' and make it a new variable. But I don't always know how long the digits will be, so can I somehow use the '&' as a reference?\
myDigits substring(0, position of &)?
Thanks
Sure, you can split the string along the &.
String s = "201057&channelTitle=null_JS";
String[] parts = s.split("&");
String newVar = parts[0];
The expected result here is
parts[0] = "201057";
parts[1] = "channelTitle=null_JS";
In production code you chould check of course the length of the parts array, in case no "&" was present.
Several programming languages also support the useful inverse operation
String s2 = parts.join("&"); // should have same value like s
Alas this one is not part of the Java standard libs, but e.g. Apache Commons Lang features it.
Always read the API first. There is an indexOf method in String that will return you the first index of the character/String you gave it.
You can use myDigits.substring(0, myDigits.indexOf('&');
However, if you want to get all of the arguments in the query separately, then you should use mvw's answer.
Im just wondering if it is possible to put a variable in a pattern match in Lua. Like something similar to the following:
var = "hello"
pattern = string.match(datasource, "(var)%s(a%+)")
The reason I need to do this is because the variable "var" will change periodically. (it will be in a loop)
Cheers in advance
Lua doesn't handle string interpolation inside of the quotes. Instead, you'll need to concatenate the parts with the var as a var reference and the rest as quote strings.
"("..var..")%s(a%+)" starts with a "(" as a string literal, concatenates the variable, then finishes off the rest of the string with a string literal.
Use "("..var..")%s(a%+)" instead.
I needed the same thing I think, a variable in a pattern match, but the above solution didn't work for me. I'm posting my solution in case it helps someone, didn't find anything else on the net like it.
I read a ': ' delimited file (name: tel) and want to search by name in the file and have the name and telephone number as answer.
local FileToSearch = h:read'*a' -- Read all the file
var = io.read() -- ask the name
string.gmatch(FileToSearch, ''..var..': '..'%d+') -- search for name, concatenate with number