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Asked: 4 years agoIn:
Teacher

I’m a beginner in Swift and I’m trying to concatenate two strings together. I’ve tried using the + operator in between the two strings, but I’m getting an error saying that the operands don’t match. Can someone please help me ...Read more

I’m a beginner in Swift and I’m trying to concatenate two strings together. I’ve tried using the + operator in between the two strings, but I’m getting an error saying that the operands don’t match. Can someone please help me figure out what I’m doing wrong?
Here’s the code that I’ve been trying to use:

let str1: String = "Hello"
let str2: String = "World"
let result: String = str1 + str2

When I try to run this code, I get the error message “Binary operator ‘+’ cannot be applied to two ‘String’ operands”. I’ve looked online to try to find a solution, but I haven’t been able to find any helpful information.
Can someone please explain to me what I’m doing wrong? How can I concatenate two string variables in Swift without getting this error? I appreciate any help that you can provide. Thank you!

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Asked: 6 years agoIn:
Begginer

I have been trying to build a Python application that can generate a text file consisting of multiple lines of text, and I was wondering if there is any way to do this without having to create a new string ...Read more

I have been trying to build a Python application that can generate a text file consisting of multiple lines of text, and I was wondering if there is any way to do this without having to create a new string object every time I want to add a line of text to the file. I stumbled upon the Python String class, and someone suggested on a forum post that I should use the StringBuilder class from C# to make my code more efficient.
However, I am not quite sure how to use the StringBuilder class in Python or if there is an equivalent class that I can use. I have tried using the io package to create a file and adding text to it, but it seems to be very slow when it comes to adding many lines of text. For example, when I tried to add 100,000 lines of text to the file, it took almost a minute to complete.
Is there a more efficient way to generate a large text file in Python? Can I use the StringBuilder class from C# in Python somehow, or is there another built-in class that I can use to make writing to a file more efficient? Any help or suggestions would be greatly appreciated.

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