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Reducing MongoDB database file size
...
copying the files to a new location
looping through the documents and re-ordering / re-solving them
replacing the original files with the new files
You can do this "compression" by running mongod --repair or by connecting directly and running db.repairDatabase().
In either case you need the spa...
Mean per group in a data.frame [duplicate]
... object. It’s easier to do what you’re after with dplyr: d %>% group_by(Name) %>% mutate(mean1=mean(Rate1), mean2=mean(Rate2))
– jbaums
May 29 '19 at 9:48
...
Disabling implicit animations in -[CALayer setNeedsDisplayInRect:]
...ppropriate key. For example, I use
NSDictionary *newActions = @{
@"onOrderIn": [NSNull null],
@"onOrderOut": [NSNull null],
@"sublayers": [NSNull null],
@"contents": [NSNull null],
@"bounds": [NSNull null]
};
layer.actions = newActions;
to disable fade in / out animations on...
Git rebase --continue complains even when all merge conflicts have been resolved
...ms to be that when rebasing, rebase --continue will also call the hook (in order to commit the lastest bout of changes). But rebase will not display the hook output, it'll just see that it failed, and then spit out a less specific error saying 'You must edit all merge conflicts and then mark them as...
View differences of branches with meld?
...ifftool -d you can still edit your working files in Meld and save them. In order to achieve that you need to compare some branch to your current working tree, for example:
git difftool -d branchname
Meld will be showing that both left and right directories are located in /tmp. However, files in t...
Garbage collector in Android
... be interpreted the other way? Maybe the GC needs to be called manually in order to collect those objects before they consume too much memory.
– hpique
Jun 25 '10 at 13:47
...
Renaming a branch in GitHub
...
Maybe the order of two commands should be reversed (i.e. upload new name first, remove old after that)
– Vi.
Jan 2 '15 at 23:12
...
Comparing date part only without comparing time in JavaScript
...ne offset, or is already UTC, just keep the date part, reflecting the date _in that timezone_
if(typeof initDate === "string" && initDate.match(/((\+|-)\d{2}:\d{2}|Z)$/gm)){
utcMidnightDateObj = new Date( initDate.substring(0,10) + 'T00:00:00Z');
} else {
// if init date is no...
Bash set +x without it being printed
...ution to this just recently when I became annoyed with it:
shopt -s expand_aliases
_xtrace() {
case $1 in
on) set -x ;;
off) set +x ;;
esac
}
alias xtrace='{ _xtrace $(cat); } 2>/dev/null <<<'
This allows you to enable and disable xtrace as in the following, wh...
How to use split?
...
According to MDN, the split() method divides a String into an
ordered set of substrings, puts these substrings into an array, and
returns the array.
???? Example
var str = 'Hello my friend'
var split1 = str.split(' ') // ["Hello", "my", "friend"]
var split2 = str.split('') // ["H"...