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How to calculate the number of occurrence of a given character in each row of a column of strings?
...o that internally.
Here's benchmark results (with a scaled up size of the test to 3000 rows)
q.data<-q.data[rep(1:NROW(q.data), 1000),]
str(q.data)
'data.frame': 3000 obs. of 3 variables:
$ number : int 1 2 3 1 2 3 1 2 3 1 ...
$ string : Factor w/ 3 levels "greatgreat","magic",....
Appending HTML string to the DOM
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child.innerHTML = str;
child = child.firstChild;
document.getElementById('test').appendChild(child);
jsFiddle.
But, Neil's answer is a better solution.
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How to check if a query string value is present via JavaScript?
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Cleaner code? ... Why not just return the indexOf test, instead of placing it in a totally useless preliminary IF statement.
– James
Aug 21 '09 at 23:09
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Remove by _id in MongoDB console
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Very close. This will work:
db.test_users.deleteOne( {"_id": ObjectId("4d512b45cc9374271b02ec4f")});
i.e. you don't need a new for the ObjectId.
Also, note that in some drivers/tools, remove() is now deprecated and deleteOne or deleteMany should be used...
Stash only one file out of multiple files that have changed with Git?
...keep. For example: I change files A and B, then stash B, because I want to test the changes in A; I find a problem with A that I then fix; I commit A; Now I can't unstash because an old version of A is in the stash for no good reason causing a merge conflict. In practise A and B might be many files,...
Animate scrollTop not working in firefox
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Note, jQuery.browser is deprecated and missing from the latest jQuery version
– spiderplant0
Sep 16 '13 at 1:25
2
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Array vs. Object efficiency in JavaScript
...faster than objects. But there is no 100% correct solution.
Update 2017 - Test and Results
var a1 = [{id: 29938, name: 'name1'}, {id: 32994, name: 'name1'}];
var a2 = [];
a2[29938] = {id: 29938, name: 'name1'};
a2[32994] = {id: 32994, name: 'name1'};
var o = {};
o['29938'] = {id: 29938, name: 'n...
send mail from linux terminal in one line [closed]
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echo "Subject: test" | /usr/sbin/sendmail user@domain.com
This enables you to do it within one command line without having to echo a text file. This answer builds on top of @mti2935's answer. So credit goes there.
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(Built-in) way in JavaScript to check if a string is a valid number
...er". "not a number" is not the same as "IEEE-794 NaN", which is what isNaN tests for. In particular, this usage fails when testing booleans and empty strings, at least. See developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/….
– EML
Dec 30 '13 at 0:33
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How to test a merge without actually merging first
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You can also do git checkout --detach and test anything you want. Later, if you want to keep your changes, do git checkout -b new_branch. And if you want to throw your changes away, checkout any branch you want (git checkout master).
– Shayan To...