#beCareful #let #var #scope #kata

letScope.js

https://www.codewars.com/kata/give-me-a-diamond/train/javascript
// doesn't work!
function diamond(n){
  if (n<=0 || n%2===0) return null;  
  function buildLine() {
    let spaces = ' '.repeat((n-i)/2);
    let stars = '*'.repeat(i);
    return spaces+stars+'\n';
  }
  const mid = '*'.repeat(n)+'\n';
  let before = '', after = '';
  for(let i=1; i<n; i+=2) before += buildLine();
  for(let i=n-2; i>0; i-=2) after += buildLine();
  return before + mid + after;
}

// it works
function diamond(n){
  if (n<=0 || n%2===0) return null;  
  function buildLine(num) {
    let spaces = ' '.repeat((n-num)/2);
    let stars = '*'.repeat(num);
    return spaces+stars+'\n';
  }
  const mid = '*'.repeat(n)+'\n';
  let before = '', after = '';
  for(let i=1; i<n; i+=2) before += buildLine(i);
  for(let i=n-2; i>0; i-=2) after += buildLine(i);
  return before + mid + after;
}

// it also does
function diamond(n){
  if (n<=0 || n%2===0) return null;  
  function buildLine() {
    let spaces = ' '.repeat((n-i)/2);
    let stars = '*'.repeat(i);
    return spaces+stars+'\n';
  }
  const mid = '*'.repeat(n)+'\n';
  let before = '', after = '';
  for(var i=1; i<n; i+=2) before += buildLine();
  for(i=n-2; i>0; i-=2) after += buildLine();
  return before + mid + after;
}