This tutorial explains multiple examples of files.
How to read a file in Nim
Suppose, you have a file
test.txt that contains the following content.
one two three
Let’s see an example to read file content.
readFile() procedure reads the entire file content into a string variable.
try: let str = readFile("test.txt") echo str except: console.log("Unable to read a file")
If the file is large, it is not good to read the entire file content into a string. It is better to read line by line.
Here is an example to read file line by line
- create file stream using the
- use the
readLine()method to read file line by line
- print the line
- when you are done with file reading, you have to close the file stream using the
try: let file = open("test.txt") defer: file.close() let line = file.readLine() echo line except: console.log("Unable to read a file")
How to write a file in Nim with an example
This is an example of writing a string into a file.
try: let fileName = "/example/test.txt" str = "one two three" writeFile(fileName, str) except: console.log("Unable to write a file")