Convert bash function to fish's [closed]

Some notes on the differences:

• setting variables
  • bash: var=value
  • fish: set var value
• functions
  • bash

    funcName() {
        ...
    }
    

  • fish

    function funcName
        ...
    end
    

• function arguments
  • bash: "$@"
  • fish: $argv
• function local variables
  • bash: local var
  • fish: set -l var
• conditionals I
  • bash: [[ ... ]] and [ ... ]
  • fish: test ... and [ ... ]
• conditionals II
  • bash: if cond; then cmds; fi
  • fish: if cond; cmds; end
• conditionals III
  • bash: cmd1 && cmd2
  • fish: cmd1; and cmd2
  • fish (as of fish 3.0): cmd1 && cmd2
• command substitution
  • bash: output=$(pipeline)
  • fish: set output (pipeline)
• process substitution
  • bash: join <(sort file1) <(sort file2)
  • fish: join (sort file1 | psub) (sort file2 | psub)

Documentation

• bash: https://www.gnu.org/software/bash/manual/bashref.html
• fish: http://fishshell.com/docs/current/index.html