You could also use a while loop, but you'd need to set your loop check variable outside of the loop and set it to true instead of false. We are using Ruby's generic loop, which is essentially the same as doing while (true). swapped = false # subtract one because Ruby arrays are zero-index based ( array_length - 1 ). size return array if array_length <= 1 loop do # we need to create a variable that will be checked so that we don't run into an infinite loop scenario. # Our method will take an array as a parameter def bubble_sort ( array ) array_length = array. If you're more of a visual learner, here is an example of how a bubble sort would work with an array of Our algorithm will perform the following comparisons. However, the algorithm does not know if it is completed because it needs to be able to complete one whole pass without any swaps to know it is sorted. As you can see, our array is actually already sorted. Since 7 < 11 and 11 < 15, we complete this pass. Since 11 > 6, we will swap again.įinally, comparing 11 with 15, we will not swap since 11 6. Next, let's compare the 11 with the next element, which is 7.
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We will start with the first number in the array, which is 11 in this case, and compare it with the second number in the array, which is 5. Suppose we have an array with the following numbers: It is so popular that even Barack Obama referenced it in this interview. One of the first sorting algorithms often taught to computer science students is the bubble sort.
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Performance matters, and showing a potential employer or your current manager that you understand the trade-offs of different sorting implementations might just tip the scale during your interview or the promotion you've been vying for.
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However, understanding the various searching and sorting algorithms is not an inconsequential endeavor. Luckily, many of the popular programming languages, Ruby included, have methods to accomplish this built-in, so you don't really have to think about or know what's happening under the hood. This often requires sorting and searching. I personally spend quite a bit of time looking for a particular element.
ELEMENTS OF PROGRAMMING INTERVIEWS RUBY SOFTWARE
If you're a software engineer, I would bet that you spend a large portion of your time manipulating data.