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What's the difference between a proc and a lambda in Ruby?
...'&' tells ruby to turn the proc into a block
proc = Proc.new { puts "Hello World" }
proc.call
# Lambda Examples
lam = lambda { |x| puts x*2 }
[1,2,3].each(&lam)
lam = lambda { puts "Hello World" }
lam.call
Differences between Procs and Lambdas
Before I get int...
How to check if a file contains a specific string using Bash
...ng on
the result of search. 0 if something was found; 1 otherwise.
$ echo hello | grep hi ; echo $?
1
$ echo hello | grep he ; echo $?
hello
0
$ echo hello | grep -q he ; echo $?
0
You can specify commands as an condition of if. If the command returns 0 in its exitcode that means that the conditi...
What is Rack middleware?
...env)
[200, {"Content-Type" => "application/json"}, ['{ "message" : "Hello!" }']]
end
end
map '/hello.json' do
run JSONServer.new
end
As the convention specifies our server has a method called call that accepts an environment hash and returns an array with the form [status, headers, bod...
What is SuppressWarnings (“unchecked”) in Java?
...ans of type erasure. For instance, the following code.
List<String> hello = List.of("a", "b");
String example = hello.get(0);
Is compiled to the following.
List hello = List.of("a", "b");
String example = (String) hello.get(0);
And List.of is defined as.
static <E> List<E> o...
URLEncoder not able to translate space character
... have to replace it, e.g.:
System.out.println(java.net.URLEncoder.encode("Hello World", "UTF-8").replace("+", "%20"));
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Merging 2 branches together in GIT
...
Say the file in A contained the word "hello", the A amended it to "HELLO" and B amended it to "Hello world". What would be the outcome of merging these files?
– dotty
Aug 4 '10 at 10:23
...
“Unresolved inclusion” error with Eclipse CDT for C standard library headers
I set up CDT for eclipse and wrote a simple hello world C program:
14 Answers
14
...
How to define an empty object in PHP
...eting) {
return greeting + " bar";
}
};
console.log(myObj.bar("Hello")); //Output: Hello bar
//PHP >= 5.4
$myObj = (object) [
"foo" => "Foo value",
"bar" => function($greeting) {
return $greeting . " bar";
}
];
var_dump($myObj->bar("Hello")); //Throw 'und...
How do I concatenate strings in Swift?
...
You can concatenate strings a number of ways:
let a = "Hello"
let b = "World"
let first = a + ", " + b
let second = "\(a), \(b)"
You could also do:
var c = "Hello"
c += ", World"
I'm sure there are more ways too.
Bit of description
let creates a constant. (sort of like an...
Sort a text file by line length including spaces
...ine-rebuilding):
It is interesting to note the difference between:
echo "hello awk world" | awk '{print}'
echo "hello awk world" | awk '{$1="hello"; print}'
They yield respectively
hello awk world
hello awk world
The relevant section of (gawk's) manual only mentions as an aside th...