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Node.js or Erlang
... I would suggest writing a standalone functional program first before you start building web apps. An even easier first step, since you seem comfortable with Javascript, is to try programming JS in a more functional style. If you use jQuery or Prototype, you've already started down this path. Tr...
How to evaluate a math expression given in string form?
...turn -parseFactor(); // unary minus
double x;
int startPos = this.pos;
if (eat('(')) { // parentheses
x = parseExpression();
eat(')');
} else if ((ch >= '0' && ch <= '9') || ch == '.') { // numbers
...
How do I create an Excel (.XLS and .XLSX) file in C# without installing Microsoft Office?
...us - GNU (LGPL) - No longer maintained
EPPlus 5 - Polyform Noncommercial - Starting May 2020
NPOI - Apache License
Here some example code for ExcelLibrary:
Here is an example taking data from a database and creating a workbook from it. Note that the ExcelLibrary code is the single line at the bott...
What is REST? Slightly confused [closed]
...rst read Ryan Tomayko's post How I explained REST to my wife; it's a great starting point. Then read Fielding's actual dissertation. It's not that advanced, nor is it long (six chapters, 180 pages)! (I know you kids in school like it short).
EDIT: I feel it's pointless to try to explain REST. It ...
Difference between GeoJSON and TopoJSON
...l shapefile : bl.ocks.org/4485308 and bl.ocks.org/4348435. TopoJSON really started to sink in when I finally grasped how I could represent multiple features (national, departmental, and municipal boundaries) with the same data in the same file (you can't do that with geojson). This is accomplished ...
How would Git handle a SHA-1 collision on a blob?
...ing SHA-256 is regularly mentioned, but not act upon for now (2012).
Note: starting 2018 and Git 2.19, the code is being refactored to use SHA-256.
Note (Humor): you can force a commit to a particular SHA1 prefix, with the project gitbrute from Brad Fitzpatrick (bradfitz).
gitbrute brute-forc...
Postgres manually alter sequence
...ts_id_seq LASTVALUE 22
This would work:
ALTER SEQUENCE payments_id_seq RESTART WITH 22;
and is equivalent to:
SELECT setval('payments_id_seq', 22, FALSE);
More in the current manual for ALTER SEQUENCE and sequence functions.
Note that setval() expects either (regclass, bigint) or (regclass, ...
How to add text inside the doughnut chart using Chart.js?
...nt, and the text. The plugin takes care of the rest.
The plugin code will start with a base font size of 30px. From there it will check the width of the text and compare it against the radius of the circle and resize it based off the circle/text width ratio.
It has a default minimum font size of 2...
redirect COPY of stdout to log file from within bash script itself
...'m not sure what Barry was about, either. Bash's exec is documented not to start new processes, >(tee ...) is a standard named pipe / process substitution, and the & in the redirection of course has nothing to do with backgrounding... ?:-)
– DevSolar
Aug...
How do I find out if first character of a string is a number?
...harAt(0) and substring(0, 1) will throw a StringIndexOutOfBoundsException. startsWith does not have this problem.
To make the entire condition one line and avoid length checks, you can alter the regexes to the following:
s.matches("\\d.*")
// or the equivalent
s.matches("[0-9].*")
If the conditi...