I experimented a bit with the various values, but could not get them high enough to show how running out of memory impacts the behavior of the functions.įor now the conclusion is that I still have not found any case where rolling your manual reverse would be beneficial. I am actually surprised that it is only twice as fast. The built-in reverse is about twice as fast as the home-made iteration. My ($length, $size, $count) = "USAGE: $0 LENGTH SIZE COUNT\n" if not $count įor a very short list with very short strings we need 1,000,000 iterations make the clock move. The timethese function will let us know if it thinks the number of iteration for the specific functions is too low to measure accurately. The higher the number of times we run the functions, the more accurate the measurement will be. Third number is the number of times we repeat the experiment. The multiplication of the first two numbers gives the approximate value for the size of the memory used for a single copy of the array. The third is the number of times we would like timethese to run each function. The second is the size of the array we create, the number of elements. print operator in Perl is used to print the values of the expressions in a List passed to it as an argument. The first one is the length of the strings we create. The strings, just the loop, I've replaced each say statement by an assignment. As I did not want to measure the time it takes to print To run each function many times and then compare the results. Then I used the timethese function of the Benchmark module Probably check which one of the above two versions is faster?įor that I created a separate implementation in which each one of the above
Perl print code#
Though I don't remember ever encountering such a situation.Īnyway, if we already implement our own reverse printing code then we should That doubling them would not fit in the memory of the computer. This could be useful if you have so many elements using greater-than instead of greater-than-or-equal in the condition),Īnd it is unclear why the author did not use the reverse function. This code is a bit longer, one can easily make off-by-one errors Largest index till 0 printing each element. Instead of reversing the list of elements in the array, weĬould use the index of each element and count down from the Following is the simple syntax for this function. Somewhere in the memory without connecting it to some variable name print accepts a list of values and every element of the list will be interpreted as an expression. This still first reverses the array, create an reversed version of it
Say join ' ', = reverse join ' ', the values in reversed order Reverse the values and store them in another array. Given an array of strings we can print the elements in reverse order in a number of ways:
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