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Why does Clojure have “keywords” in addition to “symbols”?
...ure documentation for Keywords and Symbols.
Keywords are symbolic identifiers that evaluate to themselves. They provide very fast equality tests...
Symbols are identifiers that are normally used to refer to something else. They can be used in program forms to refer to function parameters, l...
What is the difference between a HashMap and a TreeMap? [duplicate]
... HashMap allows null key and null values (Only one null key is allowed). If TreeMap uses natural ordering or its comparator, does not allow null keys, an exception will be thrown.
– madhu_karnati
Jul 18 '16 at 17:10
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Convert a list to a string in C#
...merable<T>)
Concatenates the members of a collection, using the specified separator between each member.
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PHP Foreach Pass by Reference: Last Element Duplicating? (Bug?)
...rr[2] is a reference to the value referred to by $item. To illustrate the difference, you could also unset $arr[2], and $item would be unaffected, and writing to $item wouldn't affect it.
– Paul Biggar
Nov 22 '11 at 5:58
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Count occurrences of a char in a string using Bash
...ing the string by $char and print the number of resulting fields minus 1.
If your shell does not support the <<< operator, use echo:
echo "${string}" | awk -F"${char}" '{print NF-1}'
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Declare multiple module.exports in Node.js
... a reference to module.exports.method, so behaves the same way. The only difference is we did not define module.exports, so it defaults to {}, unless I'm mistaken.
– mash
Dec 15 '14 at 18:08
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get name of a variable or parameter [duplicate]
...);
public static string GETNAME<T>(T myInput) where T : class
{
if (myInput == null)
return string.Empty;
return myInput.ToString().TrimStart('{').TrimEnd('}').Split('=')[0].Trim();
}
2) The below one can be faster though (from my tests)
GETNAME(new { variable });
public s...
Converting Stream to String and back…what are we missing?
...der reader = new StreamReader(stream);
string text = reader.ReadToEnd();
If stream has already been written to, you might want to seek to the beginning before first before reading out the text: stream.Seek(0, SeekOrigin.Begin);
...
What's “this” in JavaScript onclick?
... JavaScript this refers to the element containing the action. For example, if you have a function called hide():
function hide(element){
element.style.display = 'none';
}
Calling hide with this will hide the element. It returns only the element clicked, even if it is similar to other elements ...
Get table column names in MySQL?
...his syntax is supported by most major databases. Best to only learn 1 way if you have to.
– Kibbee
Oct 7 '09 at 1:49
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