test

test

by Chris_Walter

JavaScript

let str = '0123456789ABCDEF';
let str2 = '';
let arr = [0,1,2,3,4,5,6,7,8,9];
console.log(arr.toString());

for(let i=0; i<arr.length; i++){
  console.log(str2 += arr.pop());
}

let head =null;
if(!head){
  console.log('1');
}
if(head===null){
  console.log('2');
}
if(head){
  console.log('3');
}