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Select multiple columns in data.table by their numeric indices
...table)
dt <- data.table(a = 1, b = 2, c = 3)
# select single column by index
dt[, 2]
# b
# 1: 2
# select multiple columns by index
dt[, 2:3]
# b c
# 1: 2 3
# select single column by name
dt[, "a"]
# a
# 1: 1
# select multiple columns by name
dt[, c("a", "b")]
# a b
# 1: 1 2
Fo...
Node.js: How to send headers with form data using request module?
...d uri or options object. at request (C:\Users\pjt\node_modules\request\index.js:44:11) at Request._callback (C:\Users\pjt\routes\payment.js:170:11) at Request.self.callback (C:\Users\pjt\node_modules\request\request.js:186:22) at emitTwo (events.js:106:13) at Request.emit (events...
Version vs build in Xcode
...s to match your settings. PreferenceSpecifiers:2 means look at the item at index 2 under the PreferenceSpecifiers array in your plist file, so for a 0-based index, that's the 3rd preference setting in the array.
productVersion=$(/usr/libexec/PlistBuddy -c "Print CFBundleShortVersionString" "$INFOPL...
How to verify multiple method calls with different params
...upposed that you could just have two ArgumentCaptors and then retrieve the index and compare using the values at those indexes in both values lists
– committedandroider
Jun 4 '19 at 18:08
...
How to put an image in div with CSS?
I would like to have all my images in CSS (the only way I know how is to put them in as background images).
4 Answers
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How to remove/ignore :hover css style on touch devices
I want to ignore all :hover CSS declarations if a user visits our website via touch device. Because the :hover CSS does not make sense, and it can even be disturbing if a tablet triggers it on click/tap because then it might stick until the element loses focus. To be honest, I don't know why tou...
Array.size() vs Array.length
...uery and many other libraries.
The .length property works only when the index is an integer.
The length property will work with this type of array:
var nums = new Array();
nums[0] = 1;
nums[1] = 2;
print(nums.length); // displays 2
The length property won't work with this type of array:
var...
Difference between CouchDB and Couchbase
...e Couchbase Server 2.0 release (currently at Developer Preview 3) will add index and query functionality. While Couchbase Server 2.0 will incorporate substantial technology from the CouchDB project, it will not be upward compatible with CouchDB and it shouldn’t be viewed as a “version of CouchD...
How can I tell if a DOM element is visible in the current viewport?
....
TODO: this method does not handle two situations:
overlapping using z-index
using overflow-scroll in element's container
try something new - The Intersection Observer API explained
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Assign output of os.system to a variable and prevent it from being displayed on the screen [duplicat
...ne("cat /etc/services")
print cmdline('ls')
print cmdline('rpm -qa | grep "php"')
print cmdline('nslookup google.com')
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