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How to check a not-defined variable in JavaScript
...cript 5, which was released in 2009. You can now safely use === and !== to test for undefined without using typeof as undefined has been read-only for some time.
If you want to know if a member exists independent but don't care what its value is:
if ('membername' in object) // With inheritance
if ...
#ifdef replacement in the Swift language
... usual, you can set a different value when in Debug or when in Release.
I tested it in real code and it works; it doesn't seem to be recognized in a playground though.
You can read my original post here.
IMPORTANT NOTE: -DDEBUG=1 doesn't work. Only -D DEBUG works. Seems compiler is ignoring a f...
Citing the author of a blockquote using Markdown syntax
...e. Generated from https://en.wikipedia.org/wiki/Special:CiteThisPage
> Test-driven development (TDD) is a software development process that relies on the repetition of a very short development cycle: requirements are turned into very specific test cases, then the software is improved to pass the...
Creating a textarea with auto-resize
...
With all textarea's (multiline textbox's) site wide.
With Firefox (v31-67 tested).
With Chrome (v37-74 tested).
With IE (v9-v11 tested).
With Edge (v14-v18 tested).
With IOS Safari.
With Android Browser.
With JavaScript strict mode.
Is w3c validated.
And is streamlined and efficient.
OPTION 1 (Wi...
How to run Selenium WebDriver test cases in Chrome?
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Outdated again on 23 March. Unable to use on the latest Chrome.
– willem
Mar 23 '17 at 9:20
add a comment
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Checking for a dirty index or untracked files with Git
...s
My first thought is to just check whether these commands have output:
test -z "$(git ls-files --others)"
If it exits with 0 then there are no untracked files. If it exits with 1 then there are untracked files.
There is a small chance that this will translate abnormal exits from git ls-file...
Detect changes in the DOM
...l = document.documentElement;
var remain = 3;
// callback for the tests
function decide() {
if (support.DOMNodeInserted) {
window.addEventListener("DOMContentLoaded", function () {
if (support.DOMSubtreeModified) { // for FF 3+, Chrome
...
How do I set up a basic Ruby project?
...ct with 10 ~ 20 classes/files. I need some gems and I want to use RSpec as test framework.
4 Answers
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ruby system command check exit code
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If you are in a rails console, testing this out, just keep in mind you may lose the value of $? so you need to capture it as part of your REPL command [10] pry(main)> system("touch /root/test 2> /dev/null") => false [11] pry(main)> $?.exitstat...
How to escape double quotes in a title attribute
... Yep. <a href="#" title="Foo &quot;Bar&quot;">Testing</a> and <a href="#" title="Smart quotes &#8221;Bar&#8220;">Testing too</a> work for me.
– Olly Hodgson
Sep 20 '10 at 15:17
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