Dec26

@leapfrog-dipendra  @bhuwang  @adhpawal  @anishmanandhar @utsabneupane @Satish-Gupta @nerisa 
Fetching `length` in the loop using  `city_list.length` compels the execution of this statement , everytime the loop iterates.

It basically has no significant disadvantage when used in small list of array , But if you are processing a huge chunk of array it will degrade the performance.