How do I get a random sample from an array? [closed] - ruby

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Is there a way to pull a random element from a list? Like say, picking a random name from a list of 10 names.

You can use Array#sample if the list is an array:
names.sample
Otherwise, if it's a string, you can convert it into an array first:
names.split.sample

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What is meant by the numbers before the "Z" in "2019-10-24T00:00:00.181Z" [closed]

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2019-10-24T00:00:00.181Z
What is meant by the 181Z here? I have seen Z stands for Zulu time. But what is with the other three digits "181" here?
So is this an ISO8601 formatted time?
The 181 are the milliseconds. For example, JavaScript's Date.prototype.toISOString() method returns an ISO date string in this format.

Linear Probing in Hashing [closed]

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A hash table with 10 buckets with one slot per bucket is depicted .The Symbol S1 to S7 are initially entered using a hashing function with linear probing . The maximum no. of comparisons needed in searching an item that is not present??
I am unable to solve this question. Please explain me how it can be computed in simple language for a learner
Consider what happens when all symbols hash to the same number (say zero for simplicity). How many comparisons are required to insert S1, then S2, etc?

How to upload 2D image in website? [closed]

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I want to Upload 2D image into My Website,and my requirements are like below
I can change all Dimension of that image like i can change Hight,weight,color or many more. and i want to take Sketchup file as a image. please tell me how to do this thing.
Thanks in Advance
Do you need to do this in Ruby?
Read this: http://www.w3schools.com/php/php_file_upload.asp

Difference between Concatenation and Append [closed]

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What is the basic and essential difference between Concatenate and Append
"Concatenate" joins two specific items together, whereas "append" adds what you specify to whatever may already be there.
When use Concat or append on two strings they both may give you same result when you output them
but the
main difference is on using concatenation new string object is created where as its not the same in case of StrinBuffer APPEND()

What is lena.png and why is it used? [closed]

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I am testing/searching tests for my image manipulation algorithm and I have come across to "lena.png" multiple times. Why? Is it some kind of standard algorithm testing picture? I would like to know the history behind the picture.
Is there other similars pictures I could use? Why?

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