why is html input box only one line code example

Example 1: jquery enable submit button

//jQuery 1.6+ use:
$("#submitButtonID").prop('disabled', true); //disable 
$("#submitButtonID").prop('disabled', false); //enable

//jQuery 1.5 and below use:
$("#submitButtonID").attr('disabled','disabled'); //disable 
$("#submitButtonID").removeAttr('disabled'); //enable

Example 2: how to make one line if in js

// If statement
// if (condition) //code
if (5 > 3) return "Is greater"; // "Is greater"

// If else statement
// (condition) ? if : else
let res = (1 > 3) ? "is greater" : "is less than";// "is less than"