Forum: Ruby-core Request for boolean inject(:or|:and)

Request:

I would like to be able to do

array.inject(:or) and array.inject(:and)

Reason:

If I have an array of integers:

a=[2,3,4,5,6,7]

inject/reduce works with all of these operators:

a.inject( :+ |  :- |  :* | : /  |  :** |  :^ |  :& |  :| )

Currently, for an array b of booleans (true, false/nil) you CANNOT do:

b.inject(:or | :and).

Use Cases:

In alot of my mathematical algorithmic programming things like this
occur:

residues  = [2, 3, 4, 5, 6, 7]

{do something} if ( s=false; residues.each {|r| s ||= n%(s) == 0}; s)

or

{do something} if residues.map {|r| n%r }.include? 0

or

{do something} if residues].any? {|r| n%r == 0 }

These perform faster depending on the the Ruby VM (MRI,JRuby,or
Rubinius).

It would be nicer (and hopefully consistently faster) to be able to do:

{do something} if residues].map {|r| n%r == 0 }.inject(:or)

or

{do something} if residues].inject(:or) {|r| n%r == 0 }

so that in this example the conditional returns 'true' when the first
instance of  {|r| n%r == 0 } becomes true just as if I wrote it out
explicitly like:

{do something} if (n%r1 == 0 or n%r2 == 0 or ... n%rn == 0)

which provides the best performance on all VMs.

But as array sizes grows this isn't feasible to code for the general
case, so I do the above techniques with variable sized arrays, which are
slower than if written out explicitly.