Program to check if input is an integer or a string | Returns true if s is a number else false ; Saving the input in a string ; Function returns 1 if all elements are in range '0 ▁ - ▁ 9' ; Function returns 0 if the input is not an integer
function isNumber ( s ) { for ( let i = 0 ; i < s . length ; i ++ ) if ( s [ i ] < ' ' s [ i ] > ' ' ) return false ; return true ; } let str = " " ; if ( isNumber ( str ) ) document . write ( " " ) ; else document . write ( " " ) ;