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Handling optional parameters in javascript
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You can know how many arguments were passed to your function and you can check if your second argument is a function or not:
function getData (id, parameters, callback) {
if (arguments.length == 2) { // if only two arguments were s...
Hash String via SHA-256 in Java
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@BrendanLong Now, How to retrieval digest to String again?
– Sajad
Oct 22 '13 at 19:22
1
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hasNext in Python iterators?
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@Giorgio, there is no way to know whether another element exists without executing the code that generates it (you don't know whether the generator will execute yield or not). It is, of course, not difficult to write an adaptor that stores the result of n...
How to create a project from existing source in Eclipse and then find it?
...m are located in one directory. I used a text editor to write these files. Now I want to switch to Eclipse. How can I do it? I have tried many ways. None of them works.
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Unlimited Bash History [closed]
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After many large, ugly iterations and weird edge cases over the years, I now have a concise section of my .bashrc dedicated to this.
First, you must comment out or remove this section of your .bashrc (default for Ubuntu). If you don't, then certain environments (like running screen sessions) will...
How to place the ~/.composer/vendor/bin directory in your PATH?
...thods to install Laravel to no avail. Error messages everything I try. I'm now trying the first method in the quickstart documentation, that is, via Laravel Installer, but it says to "Make sure to place the ~/.composer/vendor/bin directory in your PATH so the Laravel executable is found when you...
What is the difference between save and export in Docker?
...r a couple of days and I already made some images (which was really fun!). Now I want to persist my work and came to the save and export commands, but I don't fully understand them.
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How do I make an HTML text box show a hint when empty?
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That is known as a textbox watermark, and it is done via JavaScript.
http://naspinski.net/post/Text-Input-Watermarks-using-Javascript-(IE-Compatible).aspx
or if you use jQuery, a much better approach:
http://digitalbush.com/proj...
Is there a way to auto expand objects in Chrome Dev Tools?
...);
} else {
console.log(item);
}
}
})();
Now running:
expandedLog({
"glossary": {
"title": "example glossary",
"GlossDiv": {
"title": "S",
"GlossList": {
"GlossEntry": {
"ID": "SGML",
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How to tell whether a point is to the right or left side of a line
...I choose two points ( a and b ) and draw an imaginary line between them. Now I want to have all points that are left from this line in one set and those that are right from this line in the other set.
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