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Find MongoDB records where array field is not empty
All of my records have a field called "pictures". This field is an array of strings.
11 Answers
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Convert a list of characters into a string
... To clarify: "".join(['a','b','c']) means Join all elements of the array, separated by the string "". In the same way, " hi ".join(["jim", "bob", "joe"]) will create "jim hi bob hi joe".
– Jack
Dec 22 '14 at 19:44
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What is the easiest way to initialize a std::vector with hardcoded elements?
I can create an array and initialize it like this:
29 Answers
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How to search a specific value in all tables (PostgreSQL)?
...ecific value.
It takes as arguments the value to search in text format, an array of table names to search into (defaults to all tables) and an array of schema names (defaults all schema names).
It returns a table structure with schema, name of table, name of column and pseudo-column ctid (non-durab...
Learning Python from Ruby; Differences and Similarities
...as compact. It's also not as efficient since it first converts the values array into a shorter intermediate array containing the values greater than 15. Then, it takes the intermediate array and generates a final array containing the squares of the intermediates. The intermediate array is then th...
Split output of command by columns using Bash?
... read a b c d; echo $c $b; }))
echo ${arr[1]} # will output 'b'`
The Array Solution
So we then end up with the answer by @frayser which is to use the shell variable IFS which defaults to a space, to split the string into an array. It only works in Bash though. Dash and Ash do not support it. ...
Cast Int to enum in Java
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@Tarrasch as arrays are mutable, values() must return a copy of the array of elements just in case you happen to change it. Creating this copy each time is relatively expensive.
– Peter Lawrey
Dec 4 ...
Initialize a byte array to a certain value, other than the default null? [duplicate]
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For small arrays use array initialisation syntax:
var sevenItems = new byte[] { 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20 };
For larger arrays use a standard for loop. This is the most readable and efficient way to do it:
var sevenT...
Warning “Do not Access Superglobal $_POST Array Directly” on Netbeans 7.4 for PHP
...r_input(INPUT_POST, 'var_name') instead of $_POST['var_name']
filter_input_array(INPUT_POST) instead of $_POST
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Looping through a hash, or using an array in PowerShell
...ion
Be careful sorting your hashtable...
Sort-Object may change it to an array:
PS> $hash.GetType()
IsPublic IsSerial Name BaseType
-------- -------- ---- --------
True True Hashtable ...