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Set a default parameter value for a JavaScript function
...S6/ES2015, default parameters are in the language specification.
function read_file(file, delete_after = false) {
// Code
}
just works.
Reference: Default Parameters - MDN
Default function parameters allow formal parameters to be initialized with default values if no value or undefined is ...
How to write to file in Ruby?
I need to read the data out of database and then save it in a text file.
7 Answers
7
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What's the difference between a file descriptor and file pointer?
... systems.
You pass "naked" file descriptors to actual Unix calls, such as read(), write() and so on.
A FILE pointer is a C standard library-level construct, used to represent a file. The FILE wraps the file descriptor, and adds buffering and other features to make I/O easier.
You pass FILE pointe...
How to run a python script from IDLE interactive shell?
...
Python3:
exec(open('helloworld.py').read())
If your file not in the same dir:
exec(open('./app/filename.py').read())
See https://stackoverflow.com/a/437857/739577 for passing global/local variables.
In deprecated Python versions
Python2
Built-in functi...
C++ Const Usage Explanation
...
Read this: https://isocpp.org/wiki/faq/const-correctness
The final const means that the function Method3 does not modify the non mutable members of its class.
const int* const means a constant pointer to a constant int: i.e...
How to get IP address of the device from code?
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This is my helper util to read IP and MAC addresses. Implementation is pure-java, but I have a comment block in getMACAddress() which could read the value from the special Linux(Android) file. I've run this code only on few devices and Emulator but le...
How do I read any request header in PHP
How should I read any header in PHP?
15 Answers
15
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How to create a file in Ruby
... {|f| f.write("write your stuff here") }
where your options are:
r - Read only. The file must exist.
w - Create an empty file for writing.
a - Append to a file.The file is created if it does not exist.
r+ - Open a file for update both reading and writing. The file must exist.
w+ - Crea...
Effective way to find any file's Encoding
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The StreamReader.CurrentEncoding property rarely returns the correct text file encoding for me. I've had greater success determining a file's endianness, by analyzing its byte order mark (BOM). If the file does not have a BOM, this can...
Using printf with a non-null terminated string
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Very bad performance due to lots of unnecessary byte reads (which come with a performance penalty if the the byte is not on a word-aligned address on most CPUs) and also the formatting parsing and applying is done for each and every character. Don't do that :-) See my answer fo...