Run results for: switch vs if-else vs lookup

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_14_4) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/12.1 Safari/605.1.15

Browser: Safari 12

Operating system: Mac OS X 10.14.4

Device Platform: Desktop

Date tested: 5 years ago

Test name	Executions per second
switch	519274.4 Ops/sec
if/else	497320.2 Ops/sec
lookup	311781.4 Ops/sec
pre-cached lookup	239740.0 Ops/sec

Script Preparation code:

var switch_func = term => {
  switch (term) {
    case 'one':
      return 1;
    case 'two':
      return 2;
    case 'three':
      return 3;
    case 'four':
      return 4;
    case 'five':
      return 5;
    case 'six':
      return 6;
    case 'seven':
      return 7;
    case 'eight':
      return 8;
    case 'nine':
      return 9;
    case 'ten':
      return 10;
    case 'eleven':
      return 11;
    case 'twelve':
      return 12;
    case 'thirteen':
      return 13;
    case 'fourteen':
      return 14;
    case 'fifteen':
      return 15;
    case 'sixteen':
      return 16;
    case 'seventeen':
      return 17;
    case 'eighteen':
      return 18;
    case 'nineteen':
      return 19;
    case 'twenty':
      return 20;
  }
};

var ifelse_func = term => {
  if (term === 'one') {
    return 1;
  } else if (term === 'two') {
    return 2;
  } else if (term === 'three') {
    return 3;
  } else if (term === 'four') {
    return 4;
  } else if (term === 'five') {
    return 5;
  } else if (term === 'six') {
    return 6;
  } else if (term === 'seven') {
    return 7;
  } else if (term === 'eight') {
    return 8;
  } else if (term === 'nine') {
    return 9;
  } else if (term === 'ten') {
    return 10;
  } else if (term === 'eleven') {
    return 11;
  } else if (term === 'twelve') {
    return 12;
  } else if (term === 'thirteen') {
    return 13;
  } else if (term === 'fourteen') {
    return 14;
  } else if (term === 'fifteen') {
    return 15;
  } else if (term === 'sixteen') {
    return 16;
  } else if (term === 'seventeen') {
    return 17;
  } else if (term === 'eighteen') {
    return 18;
  } else if (term === 'nineteen') {
    return 19;
  } else if (term === 'twenty') {
    return 20;
  }
};

var lookup_func = term => {
  var lookup = {
    one: 1,
    two: 2,
    three: 3,
    four: 4,
    five: 5,
    six: 6,
    seven: 7,
    eight: 8,
    nine: 9,
    ten: 10,
    eleven: 11,
    twelve: 12,
    thirteen: 13,
    fourteen: 14,
    fifteen: 15,
    sixteen: 16,
    seventeen: 17,
    eighteen: 18,
    nineteen: 19,
    twenty: 20,
  };
  return lookup[term];
};

var cached_lookup = {
  one: 1,
  two: 2,
  three: 3,
  four: 4,
  five: 5,
  six: 6,
  seven: 7,
  eight: 8,
  nine: 9,
  ten: 10,
  eleven: 11,
  twelve: 12,
  thirteen: 13,
  fourteen: 14,
  fifteen: 15,
  sixteen: 16,
  seventeen: 17,
  eighteen: 18,
  nineteen: 19,
  twenty: 20,
};

var cached_lookup_func = term => cached_lookup[term];

Tests:

switch
switch_func('one'); switch_func('seven'); switch_func('twelve'); switch_func('ten'); switch_func('nineteen'); switch_func('three'); switch_func('thirteen'); switch_func('eight'); switch_func('seventeen'); switch_func('two'); switch_func('five'); switch_func('eighteen'); switch_func('twenty'); switch_func('nine'); switch_func('eleven'); switch_func('fourteen'); switch_func('six'); switch_func('fifteen'); switch_func('sixteen'); switch_func('four');
if/else
ifelse_func('one'); ifelse_func('seven'); ifelse_func('twelve'); ifelse_func('ten'); ifelse_func('nineteen'); ifelse_func('three'); ifelse_func('thirteen'); ifelse_func('eight'); ifelse_func('seventeen'); ifelse_func('two'); ifelse_func('five'); ifelse_func('eighteen'); ifelse_func('twenty'); ifelse_func('nine'); ifelse_func('eleven'); ifelse_func('fourteen'); ifelse_func('six'); ifelse_func('fifteen'); ifelse_func('sixteen'); ifelse_func('four');
lookup
lookup_func('one'); lookup_func('seven'); lookup_func('twelve'); lookup_func('ten'); lookup_func('nineteen'); lookup_func('three'); lookup_func('thirteen'); lookup_func('eight'); lookup_func('seventeen'); lookup_func('two'); lookup_func('five'); lookup_func('eighteen'); lookup_func('twenty'); lookup_func('nine'); lookup_func('eleven'); lookup_func('fourteen'); lookup_func('six'); lookup_func('fifteen'); lookup_func('sixteen'); lookup_func('four');
pre-cached lookup
cached_lookup_func('one'); cached_lookup_func('seven'); cached_lookup_func('twelve'); cached_lookup_func('ten'); cached_lookup_func('nineteen'); cached_lookup_func('three'); cached_lookup_func('thirteen'); cached_lookup_func('eight'); cached_lookup_func('seventeen'); cached_lookup_func('two'); cached_lookup_func('five'); cached_lookup_func('eighteen'); cached_lookup_func('twenty'); cached_lookup_func('nine'); cached_lookup_func('eleven'); cached_lookup_func('fourteen'); cached_lookup_func('six'); cached_lookup_func('fifteen'); cached_lookup_func('sixteen'); cached_lookup_func('four');

Run results for: switch vs if-else vs lookup

yo yo

switch

if/else

lookup

pre-cached lookup