A helpful list of antonyms with the same word length for your everyday variable names:

• lo/hi
• up/dn
• rd/wr
• beg/end
• bid/ask
• lhs/rhs (left/right hand side)
• src/dst
• top/mid/bot
• get/set
• old/new⁰
• min/mid/max²
• new/del¹⁰
• add/del¹
• fix/var
• one/any/all/non/nil
• yay/nay
• give/take
• head/tail
• less/more
• play/stop
• pred/succ
• prev/curr/next²
• push/pull
• this/that⁰
• true/fake⁰
• yeah/nope
• east/west
• below/above
• north/south
• start/pause/break⁰
• sugar/spice
• large/small
• lower/upper
• allow/block
• inner/outer
• include/exclude
• accept/reject
• permit/refuse
• permit/forbid
• permitted/forbidden
• create/insert/remove/delete⁰
• encode/decode/verify
• source/target
• unique/shared
• primary/counter
• relative/absolute
• producer/consumer
• positive/negative
• permanent/temporary

⁰ C++ keyword, cannot be used as an identifier
¹ Python keyword, cannot be used as an identifier
² Python builtin, should not be used as an unqualified identifier, but ok as member

• get/got/gen (gen for generate)
• width/depth
• length/height

• localhost/127.0.0.1 😂
• this->/other.

Several [Twitter] [threads] [1].