Ruby from two dimension to one dimension array-CodePudding

I have the following array:

arr = [
 "Assignment:Chapter 1 Code Exercises (Real)",
 [100, 100, 100, 100, 100, 100, 100, 100],
 "Assignment:Chapter 2 Code Exercises (Real)", 
 [93, 75, 100, 100, 100, 55, 75, 100],
 "Assignment:Chapter 3 Code Exercises (Real)",
 [100, 80, 100, 100, 90, 85, 65, 100],
 "Assignment:Chapter 4 Code Exercises (Real)",
 [100, 90, 100, 100, 95, 100, 75, 70],
 "Assignment:Chapter 5 Code Exercises (Real)",
 [50, 100, 100, 100, 60, 70, 90, 100],
 "Assignment:Chapter 6 Code Exercises (Real)",
 [0, 85, 100, 100, 60, 85, 70, 85, 100],
 "Assignment:Chapter 14 Code Exercises (Real)",
 [75, 90, 100, 100, 0, 100, 0, 100],
 "Assignment:Chapter 15 Code Exercises (Real)",
 [97, 100, 100, 100, 0, 100, 0, 100]
]

I would like to convert this to:

[
 ["Assignment:Chapter 1 Code Exercises (Real)", 100, 100, 100, 100, 100, 100, 100, 100], 
 ["Assignment:Chapter 2 Code Exercises (Real)", 93, 75, 100, 100, 100, 55, 75, 100],
 ["Assignment:Chapter 3 Code Exercises (Real)", 100, 80, 100, 100, 90, 85, 65, 100],
 ["Assignment:Chapter 4 Code Exercises (Real)", 100, 90, 100, 100, 95, 100, 75, 70],
 ["Assignment:Chapter 5 Code Exercises (Real)", 50, 100, 100, 100, 60, 70, 90, 100],
 ["Assignment:Chapter 6 Code Exercises (Real)", 0, 85, 100, 100, 60, 85, 70, 85], 100],
 ["Assignment:Chapter 14 Code Exercises (Real)", 75, 90, 100, 100, 0, 100, 0, 100],
 ["Assignment:Chapter 15 Code Exercises (Real)", 97, 100, 100, 100, 0, 100, 0, 100]
]

flatten so too "flat". I also tried flatten(1).

CodePudding user response：

array.each_slice(2).map { |(x,y)| [x]   y }
#=> [["Assignment:Chapter 1 Code Exercises (Real)", 100, 100, 100, 100, 100, 100, 100, 100],               
    ["Assignment:Chapter 2 Code Exercises (Real)", 93, 75, 100, 100, 100, 55, 75, 100],                   
    ["Assignment:Chapter 3 Code Exercises (Real)", 100, 80, 100, 100, 90, 85, 65, 100],                   
    ["Assignment:Chapter 4 Code Exercises (Real)", 100, 90, 100, 100, 95, 100, 75, 70],                   
    ["Assignment:Chapter 5 Code Exercises (Real)", 50, 100, 100, 100, 60, 70, 90, 100],            
    ["Assignment:Chapter 6 Code Exercises (Real)", 0, 85, 100, 100, 60, 85, 70, 85, 100],          
    ["Assignment:Chapter 14 Code Exercises (Real)", 75, 90, 100, 100, 0, 100, 0, 100],             
    ["Assignment:Chapter 15 Code Exercises (Real)", 97, 100, 100, 100, 0, 100, 0, 100]]

CodePudding user response：

> Hash[*a].map(&:flatten)
=> 
[["Assignment:Chapter 1 Code Exercises (Real)", 100, 100, 100, 100, 100, 100, 100, 100],
 ["Assignment:Chapter 2 Code Exercises (Real)", 93, 75, 100, 100, 100, 55, 75, 100],
 ["Assignment:Chapter 3 Code Exercises (Real)", 100, 80, 100, 100, 90, 85, 65, 100],
 ["Assignment:Chapter 4 Code Exercises (Real)", 100, 90, 100, 100, 95, 100, 75, 70],
 ["Assignment:Chapter 5 Code Exercises (Real)", 50, 100, 100, 100, 60, 70, 90, 100],
 ["Assignment:Chapter 6 Code Exercises (Real)", 0, 85, 100, 100, 60, 85, 70, 85, 100],
 ["Assignment:Chapter 14 Code Exercises (Real)", 75, 90, 100, 100, 0, 100, 0, 100],
 ["Assignment:Chapter 15 Code Exercises (Real)", 97, 100, 100, 100, 0, 100, 0, 100]]

where a is the first array above.