Memory aids for the callback parameters in map/filter/reduce:

Super summary: eia + ceia

eia + ceia

Or:

eia + cvia
xia + cvia
via + cvia

`.map((e,i,a)=>{})`

"mapeia"
or "maxia" (.map((x,i,a)=>{})

example:

['a','b','c'].map((e,i,a)=>console.log(e,i,a))

`.filter((e,i,a)=>{})`

"filtereia"
or "fixia" (.filter((x,i,a)=>{}))

example:

['a','b','c'].filter((e,i,a)=>console.log(e,i,a))

`.reduce((c,v,i,a)=>{},init)`

"reducecvia"
or "recvia", which sounds like "wreck vehicle" or "rec vehicle"
or "redceia" (.reduce((c,e,i,a)=>{},init))

example:

['a','b','c'].reduce((c,v,i,a)=>{
  console.log(c,v,i,a);
  return c+v+'.';
}, '');