Run results for: hacked if test vs plain if test

Run details:

User agent: Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:63.0) Gecko/20100101 Firefox/63.0

Browser: Firefox 63

Operating system: Ubuntu

Device Platform: Desktop

Date tested: 5 years ago

Test name	Executions per second
plain if	21648910.0 Ops/sec
hacked if	12364830.0 Ops/sec

Script Preparation code:

function sel1(name) {
  var l = name.length;
  var ch = name[0];
  if (l==3) {
    if (ch === 'o') {
    	if (name === 'one') return 1;
  	}
  	if (ch === 't') {
    	if (name === 'two') return 2;
        if (name === 'ten') return 10;
  	}
  	if (ch === 's') {
    	if (name === 'six') return 6;
  	}
  }
  if (l==4) {
    if (ch === 'f') {
    	if (name === 'four') return 4;
        if (name === 'five') return 5;
  	}
  	if (ch === 'n') {
    	if (name === 'nine') return 9;
  	}
  }
  if (l==5) {
    if (ch === 't') {
    	if (name === 'three') return 3;
  	}
  	if (ch === 's') {
    	if (name === 'seven') return 7;
  	}
  	if (ch === 'e') {
    	if (name === 'eight') return 8;
  	}
  }
}

function sel2(name) {
    if (name === 'one') return 1;
  	if (name === 'two') return 2;
    if (name === 'ten') return 10;
  	if (name === 'six') return 6;
   	if (name === 'four') return 4;
    if (name === 'five') return 5;
   	if (name === 'nine') return 9;
   	if (name === 'three') return 3;
   	if (name === 'seven') return 7;
   	if (name === 'eight') return 8;
}

Tests:

plain if
sel2('one') sel2('two') sel2('three') sel2('four') sel2('five') sel2('six') sel2('seven') sel2('eight') sel2('nine') sel2('ten')
hacked if
sel1('one') sel1('two') sel1('three') sel1('four') sel1('five') sel1('six') sel1('seven') sel1('eight') sel1('nine') sel1('ten')

Run results for: hacked if test vs plain if test

just for fun

plain if

hacked if