Bhawan questions

• Create list of lists from list of json objects ruby
• memory allocation in array of structure using double pointers in C
• Behaviour of local and class variables in java
• move lines into a file by number of columns using awk
• sequence number vs version number in elasticsearch
• compiler "error: passing ‘const something’ as ‘this’ argument discards qualifiers"
• Segmentation fault on erasing the last element from the vector C++
• Alternatives of array_agg() or string_agg() on redshift
• Decrement of end of std::map

Bhawan answers