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If I create a new array with 10 elements, and populate it with the numbers 1 through 10, then call delete_at(4), the fourth element is "deleted".
How does this work, though? Does it completely remove the element and index and reduce the size of the array to 9, or does it nullify (or make nil) the value of that index and push it the the end of the array?
It copies all of the elements after the position back one with a single memory copy, then reduces the size of the array by one.
Why do you ask? Are you trying to reason about performance?
Ref: https://github.com/ruby/ruby/blob/9f45081627cf682b3ee938353da134d6f28560da/array.c#L2964
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Here is an example sheet:
https://docs.google.com/spreadsheets/d/1P91qqhClA8oO3-N9OGSxrFH-6lXxttZ3IN4bIGRGjHw/edit?usp=sharing
I am trying to get the column range returned in when the string in INPUT!B1 can be seen in DATABASE!A2:A into INPUT!C1:C3
You can use FILTER() function.
=FILTER(DATABASE!A:C,DATABASE!A:A=B1)
VLookup(), Index/Match(), QUERY() all these functions will work for you.
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I am inserting some keyword like Don't , has'nt in Sqlite which is not inserted.any one have idea about it.
Use ' as escape character and insert it like this:
dont''t
Documentation:
A single quote within the string can be encoded by putting two single quotes in a row - as in Pascal
In case you are using an API to connect with Sqlite, instead of manipulating the original string a better approach would be to use sqlite3_bind_text() function to bind a value to a ? placeholder in the SQL. Thanks to #Rob for pointing this out.
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I want to make a regular express to parse out the value (29.0) from this node:
"<currentPrice currencyId="USD">29.0</currentPrice>"
in an xml document. And I would like the value (price) of each and every instance of that node. There is no limit or minimum to what price could be.
Use Nokogiri::XML(myXml).xpath('//currentPrice/text()').map(&:to_s)
Using a regexp to parse XML makes certain infant deities cry.
Here is another way to answer this question, by using Ruby's standard Library REXML
require 'rexml/document'
#doc = REXML::Document.new('<currentPrice currencyId="USD">29.0</currentPrice>')
#doc.get_elements("//currentPrice")[0].text # => "29.0"
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Given I have:
int1, int2, int3 = 1, nil, 3
how would I subtract these ints from another variable, only if they weren't nil? I can write something sloppy, but I want a single line process if possible.
another_variable - [int1, int2, int3].compact.sum
othervariable - int1.to_i # will turn nil into 0
You can write something like
ans = int1 && (int2-int1)
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Im making an ios game very similar to minesweeper in terms of layout and i have no clue how to do taxicab distance. Do I need to use core graphics or just an array or what?
See here .
In essence, the taxicab distance between (x1,y1) and (x2,y2) is |x1-x2| + |y1-y2| (|z| means abs(z))
My approach would have been to use a two-dimensional array - it just seems the simplest and most natural representation of the problem.
I would set all values of the array to 0, randomize and reset certain indices to -1 (mines), and increment the count of each adjacent square of these indices by 1.