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How do I search for an object by its ObjectId in the mongo console?
...wrote the answer if you are using mongodb using node.js
You don't need to convert the id into an ObjectId. Just use :
db.collection.findById('4ecbe7f9e8c1c9092c000027');
this collection method will automatically convert id into ObjectId.
On the other hand :
db.collection.findOne({"_id":'4ecbe7...
How can I get sin, cos, and tan to use degrees instead of radians?
...It seems to me that it would be more useful to you to have a function that converts a degree input to radians, like this:
function toRadians (angle) {
return angle * (Math.PI / 180);
}
which you could use to do something like tan(toRadians(45)).
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Easy way to turn JavaScript array into comma-separated list?
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Here's an implementation that converts a two-dimensional array or an array of columns into a properly escaped CSV string. The functions do not check for valid string/number input or column counts (ensure your array is valid to begin with). The cells can c...
Count with IF condition in MySQL query
...COALESCE() as mentioned in other answers, many language APIs automatically convert NULL to '' when fetching the value. For example with PHP's mysqli interface it would be safe to run your query without COALESCE().
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How do I use vi keys in ipython under *nix?
... following in your ~/.inputrc file:
set editing-mode vi
set keymap vi
set convert-meta on
Source: http://www.jukie.net/bart/blog/20040326082602
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How do I output an ISO 8601 formatted string in JavaScript?
...very to-ISO method on the web drops the timezone information by applying a convert to "Z"ulu time (UTC) before outputting the string. Browser's native .toISOString() also drops timezone information.
This discards valuable information, as the server, or recipient, can always convert a full ISO date ...
How to insert newline in string literal?
... If you copy-paste that code into an editor on Windows, it'll probably get converted to \r\n. Do the same on a Unix-like platform and it'll probably get converted to \n instead.
– Xiyng
Nov 30 '16 at 15:57
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Convert Python dictionary to JSON array
... 'answer',
autoActivateHeartbeat: false,
convertImagesToLinks: true,
noModals: true,
showLowRepImageUploadWarning: true,
reputationToPostImages: 10,
bindNavPrevention: true,
postfix...
How can I extract audio from video with ffmpeg?
...a .mkv vedio.why it is not working for .avi,is there any ffmpeg command to convert .avi
– user1269669
Mar 29 '12 at 15:44
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Bitwise operation and usage
...rns a tuple of its Red, Green and Blue values.
def hexToRgb(value):
# Convert string to hexadecimal number (base 16)
num = (int(value.lstrip("#"), 16))
# Shift 16 bits to the right, and then binary AND to obtain 8 bits representing red
r = ((num >> 16) & 0xFF)
# Shif...