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Ruby on Rails: How do you add add zeros in front of a number if it's under 10?
... lot of people using sprintf (which is the right thing to do), and I think if you want to do this for a string it's best to keep in mind the rjust and ljust methods:
"4".rjust(2, '0')
This will make the "4" right justified by ensuring it's at least 2 characters long and pad it with '0'. ljust doe...
How to change a Git remote on Heroku
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If you're working on the heroku remote (default):
heroku git:remote -a [app name]
If you want to specify a different remote, use the -r argument:
heroku git:remote -a [app name] -r [remote]
EDIT: thanks to Алекс...
How to use a variable for the key part of a map
... strings by default: [a:1] is equivalent to ['a':1]. This can be confusing if you define a variable named a and that you want the value of to be the key in your map. If this is the case, then you must escape >the key by adding parenthesis..
– Michal Bernhard
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How to delete/unset the properties of a javascript object? [duplicate]
...to remove/unset the properties of a JS object so they'll no longer come up if I loop through the object doing for (var i in myObject) . How can this be done?
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Clear Application's Data Programmatically
...highly recommend using it in new applications:
import android.os.Build.*;
if (VERSION_CODES.KITKAT <= VERSION.SDK_INT) {
((ActivityManager)context.getSystemService(ACTIVITY_SERVICE))
.clearApplicationUserData(); // note: it has a return value!
} else {
// use old hacky way, w...
Converting A String To Hexadecimal In Java
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@Kaleb Have you idea if possible to convert resulted String back? If, yes, can you give me some hints? Thanks!
– artaxerxe
Apr 11 '12 at 10:06
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How to implement __iter__(self) for a container object (Python)
... Actually -- with this use case -- you only need to raise StopIteration if you wish to stop yielding values before some_list is exhausted.
– Tim Peoples
Jun 29 '16 at 0:23
22
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Grep characters before and after match?
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What's the significance of the first number in the curly-bracketed pairs? Like the 0s in "grep -E -o ".{0,5}test_pattern.{0,5}" test.txt "?
– Lew Rockwell Fan
Jun 23 '17 at 2:28
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Total number of items defined in an enum
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System.Enum.GetNames, if you aren't already including the System namespace.
– Brett Pennings
Feb 3 '15 at 2:55
5
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Why doesn't adding CORS headers to an OPTIONS route allow browsers to access my API?
...n, the CORS spec only requires the OPTIONS call to precede the POST or GET if the POST or GET has any non-simple content or headers in it.
Content-Types that require a CORS pre-flight request (the OPTIONS call) are any Content-Type except the following:
application/x-www-form-urlencoded
multipart...