用空项替换数组中的每个项

Question

This is admittedly a bit of an odd issue, but I need to basically empty every item in an array (but keep the item itself).

For instance, if I have this array: [ 0, 5, 4, 7, 1 ]

I need to change it to: [ '', '', '', '', '']

I'm using Ruby 1.9.3.

Some charting software I'm using requires an array for labels and the only way to hide those labels is to make the corresponding items blank. Yes, lame.

Answer 1

Enumerable#map replaces every element with the result of calling a block:

array = [ 0, 5, 4, 7, 1 ]
array.map { '' }
#=> ['', '', '', '', '']

If you wanted to mutate the original (if I understand your question this is precisely what you do NOT want to do), then use #map!

array.map! { '' }
array
#=> ['', '', '', '', '']