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unable to install pg gem
... me:
Install the postgresql-devel package, this will solve the issue of pg_config missing.
sudo apt-get install libpq-dev
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What's the difference of strings within single or double quotes in groovy?
... this syntax and always result in a plain String. More on the topic here:
http://docs.groovy-lang.org/latest/html/documentation/index.html#all-strings
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How to disable UITextField editing but still accept touch?
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swift 4: ` func textField(_ textField: UITextField, shouldChangeCharactersIn range: NSRange, replacementString string: String) -> Bool { return false } `
– lionello
Jan 23 '18 at 5:08
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What is “above-the-fold content” in Google Pagespeed?
...ent is loaded.
This is a video presentation from Google on this subject:
http://www.youtube.com/watch?v=YV1nKLWoARQ
The emphasis is on getting users something to do within the first second. The reasoning behind putting the CSS for the ATF content directly into the HTML reflects their research on ...
Check for array not empty: any?
...lues to true or if its empty.
The method empty? comes from the Array class
http://ruby-doc.org/core-2.0.0/Array.html#method-i-empty-3F
It's used to check if the array contains something or not. This includes things that evaluate to false, such as nil and false.
>> a = []
=> []
>> a.em...
Determine the number of NA values in a column
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If you are looking for NA counts for each column in a dataframe then:
na_count <-sapply(x, function(y) sum(length(which(is.na(y)))))
should give you a list with the counts for each column.
na_count <- data.frame(na_count)
Should output the data nicely in a dataframe like:
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Human readable javascripts in chrome developer tools
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There is the http://jsbeautifier.org/ for online usage (you need to copy/paste).
On that site they have a link to fiddler (a web debugging proxy) and a JavaScript Formatter for it (3rd extention).
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Why can't the tag contain a tag inside it?
...look for allowed containment relations is the HTML spec. See, for example, http://www.w3.org/TR/html4/sgml/dtd.html. It specifies which elements are block elements and which are inline. For those lists, search for the section marked "HTML content models".
For the P element, it specifies the followi...
Get an array of list element contents in jQuery
...Here's the full documentation for jQuery's map function, it's quite handy: http://api.jquery.com/jQuery.map/
Just to answer fully, here's the complete functionality you were looking for:
$.map( $('li'), function (element) { return $(element).text() }).join(', ');
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SQL Server ':setvar' Error
...re highlighted, your script should run correctly now.
Previous versions:
http://blog.sqlauthority.com/2013/06/28/sql-server-how-to-set-variable-and-use-variable-in-sqlcmd-mode/
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