Discussion on: Largest no. in Array using Recursion

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It is not very helpful to check each call to see if arr is an array, if the array is empty, or if it only has one value.

"use strict";

const findMax = ( arr ) => {
  const fmax = ( arr ) => {
    if ( arr[ idx ] > max ) 
      max = arr[ idx ]
    if ( idx < arr.length ) {
      idx++;
      fmax( arr )
    }
    return max
  }
  if ( !Array.isArray( arr ) ) throw 'Not an array'
  if ( arr.length === 0 ) return undefined
  if ( arr.length === 1 ) return arr[ 0 ]
  let idx = 0
  let max = arr[ idx ]
  max = fmax( arr )
  return max
}
console.log ( findMax ( [ -10,-9 ] ) )
console.log ( findMax ( [ 1,9,100,28,78,10 ] ) )