Test Revision

function foo(str) {
  counts = [];
  maxCh = str.charAt(0);
  counts[maxCh] = 1;

  for (i = 1; i < str.length; i++) {
    ch = str.charAt(i);

    if (ch == ' ')
      continue;

    if (!counts[ch]) {
      counts[ch] = 0;
    }

    if (ch == 'o')
      counts[ch] += 0.5;
    else
      counts[ch]++;

    if (counts[ch] > counts[maxCh]) {
      maxCh = ch;
    }
  }
  return Math.ceil(counts[maxCh]);
}

// Tests

if (foo('coffee kebab') != 3) {
  throw new Error('Test failed for "coffee kebab". Expected 3, returned ' + foo('coffee kebab'));
}

if (foo('book') != 1) {
  throw new Error('Test failed for "book". Expected 1, returned ' + foo('book'));
}

if (foo('ffacebook') != 2) {
  throw new Error('Test failed for "ffacebook". Expected 2, returned ' + foo('ffacebook'));
}

if (foo('fa ce bo ok') != 1) {
  throw new Error('Test failed for "fa ce bo ok". Expected 1, returned ' + foo('fa ce bo ok'));
}
 

function foo(str) {
    counts = [];
    maxCh = str.charAt(0);
    counts[maxCh] = 1;

    for (i = 1; i < str.length; i++) {
        ch = str.charAt(i);
        
        if (!counts[ch]) {
            counts[ch] = 0;
        }
        
        if (++counts[ch] > counts[maxCh]) {
            maxCh = ch;
        }
    }
    return counts[maxCh];
}

// Tests

if (foo('coffee kebab') != 3) {
  throw new Error('Test failed for "coffee kebab". Expected 3, returned ' + foo('coffee kebab'));
}

if (foo('book') != 1) {
  throw new Error('Test failed for "book". Expected 1, returned ' + foo('book'));
}

if (foo('ffacebook') != 2) {
  throw new Error('Test failed for "ffacebook". Expected 2, returned ' + foo('ffacebook'));
}

if (foo('fa ce bo ok') != 1) {
  throw new Error('Test failed for "fa ce bo ok". Expected 1, returned ' + foo('fa ce bo ok'));
}
 

function foo(str) {
  counts = [0,0,0,0,0,0,0];
  max = 0;
  idx = 0;

  for (i = 1; i < str.length; i++) {
    ch = str.charAt(i);
    
    switch (ch) {
      case 'f': idx = 0; break;
      case 'a': idx = 1; break;
      case 'c': idx = 2; break;
      case 'e': idx = 3; break;
      case 'b': idx = 4; break;
      case 'o': idx = 5; break;
      case 'k': idx = 6; break;
      default: idx=0;
    }
    
    if (ch == 'o') counts[idx] += 0.5;
    else counts[idx]++;
    
    if (counts[idx] > max) {
      max = Math.ceil(counts[idx]);
    }
  }
  return max;
}

// Tests

if (foo('coffee kebab') != 3) {
  throw new Error('Test failed for "coffee kebab". Expected 3, returned ' + foo('coffee kebab'));
}

if (foo('book') != 1) {
  throw new Error('Test failed for "book". Expected 1, returned ' + foo('book'));
}

if (foo('ffacebook') != 2) {
  throw new Error('Test failed for "ffacebook". Expected 2, returned ' + foo('ffacebook'));
}

if (foo('fa ce bo ok') != 1) {
  throw new Error('Test failed for "fa ce bo ok". Expected 1, returned ' + foo('fa ce bo ok'));
}