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What is a elegant way in Ruby to tell if a variable is a Hash or an Array?
...esponds to :each
If you really want to know the type and if it is Hash or Array then you can do:
["Hash", "Array"].include?(@some_var.class) #=> check both through instance class
@some_var.kind_of?(Hash) #=> to check each at once
@some_var.is_a?(Array) #=> same as kind_of
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When should I use a List vs a LinkedList
...over List (this is .net specific): since the List is backed by an internal array, it is allocated in one contiguous block. If that allocated block exceeds 85000 bytes in size, it will be allocated on the Large Object Heap, a non-compactable generation. Depending on the size, this can lead to heap fr...
Merging objects (associative arrays)
What’s the best/standard way of merging two associative arrays in JavaScript? Does everyone just do it by rolling their own for loop?
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Check if array is empty or null
I would like to know how to check if an array is empty or null in jQuery. I tried array.length === 0 but it didn't work. It did not throw any error either.
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How to concatenate strings of a string field in a PostgreSQL 'group by' query?
... 8.4 or later:
PostgreSQL 8.4 (in 2009) introduced the aggregate function array_agg(expression) which concatenates the values into an array. Then array_to_string() can be used to give the desired result:
SELECT company_id, array_to_string(array_agg(employee), ', ')
FROM mytable
GROUP BY company_id...
How can I make Array.Contains case-insensitive on a string array?
I am using the Array.Contains method on a string array. How can I make that case-insensitive?
4 Answers
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From an array of objects, extract value of a property as array
I have JavaScript object array with the following structure:
16 Answers
16
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How to find if an array contains a specific string in JavaScript/jQuery? [duplicate]
Can someone tell me how to detect if "specialword" appears in an array? Example:
5 Answers
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Way to ng-repeat defined number of times instead of repeating over array?
...eat a defined number of times instead of always having to iterate over an array?
26 Answers
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How can I split a comma delimited string into an array in PHP?
I need to split my string input into an array at the commas.
10 Answers
10
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