Array select with multiple conditions ruby

Question

I can do:

@items = @items.select {|i| i.color == 'blue'}
@items = @items.select {|i| i.color == 'blue' || i.color == 'red'}

What if I am given an unknown amount of colors and I want to select them all? i.e.

['red','blue','green','purple']
# or
['blue','red']

I've been working on a mess of code that creates several temporary arrays and then merges or flattens them into one, but I'm really unhappy with it.

Alex Reisner · Accepted Answer · 2009-12-18 06:23:08Z

25

Try this:

colors = ['red','blue','green','purple']
@items = @items.select { |i| colors.include?(i.color) }

You might also want to consider this instead, for in-place changes:

@items.reject! { |i| !colors.include?(i.color) }

answered Dec 18, 2009 at 6:23

Alex Reisner

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1 Comment

Awesome, the second is perfect.

Karmen Blake · Accepted Answer · 2009-12-18 06:30:45Z

1

not sure I fully understand your question but would work for you?

colors_array = ['blue','red','whatever']
@items = @items.select {|i| colors_array.include?(i)}

answered Dec 18, 2009 at 6:30

Karmen Blake

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