While i was working on arrays, I missed a comma in declaration of the nested array in Ruby but language interpreting this in other way. If anyone familiar about this behaviour please give a thought.
arr = [1,2[1,8]]
[1, 1]
arr = [1,5[6,4]]
[1, 0]
arr = [1,3[1,6]]
[1, 1]
arr = [1,6[1,6]]
[1, 3]
arr = [1,7[1,6]]
[1, 3]
arr = [1,0[1,6]]
[1, 0]
arr = [1,8[1,6]]
[1, 4]
An exception should be raised based on False Declaration
An exception should be raised [...]
[1,8[1,6]] might look like a syntax error in the context of an array literal but it's actually a perfectly valid Ruby expression. It creates an array with two elements: 1 and the result from 8[1,6] which is 4.
8[1,6] extracts a part of the integer 8. It does this by treating 8 as a sequence of bits (the binary number 00001000₂). From these bits, 6 bits are extracted, starting at bit 1: (with bit 0 being the right-most bit)
0b00001000[1,6] #=> 8
↓↓↓↓↓↓
0b000100 #=> 4
See the docs for Integer#[] for details.
This is very similar to "hello ruby"[1,6] which extracts a part of the string by treating it as a sequence of characters: (with character 0 being the left-most character)
"hello ruby"[1,6]
↓↓↓↓↓↓
"ello r"