Created
April 3, 2020 11:31
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'use strict'; | |
(function () { | |
var RADIANS_IN_A_CIRCLE = 2 * Math.PI; | |
var ONE_DEGREE = RADIANS_IN_A_CIRCLE / 360; | |
var lookup = []; | |
for (var index = 0; index < 360; ++index) { | |
lookup[index] = Math.sin(index * ONE_DEGREE); | |
} | |
doOneMillionLookupsAroundWholeCircle(); | |
doOneMillionLookupsAroundWholeCircle(); | |
doOneMillionCalculationsAroundWholeCircle(); | |
doOneMillionCalculationsAroundWholeCircle(); | |
function doOneMillionLookupsAroundWholeCircle() { | |
var start = new Date(); | |
var result = 0; | |
for ( | |
var count = 0; | |
count < 1000000; | |
++count | |
) { | |
for ( | |
var angleDegrees = 0; | |
angleDegrees < 360; | |
++angleDegrees | |
) { | |
result = result + lookup[angleDegrees]; | |
} | |
} | |
var end = new Date(); | |
var diff = end - start; | |
console.log(`Sin lookup (ES5) result: ${result}`); | |
console.log(`Sin lookup (ES5) time: ${diff}`); | |
} | |
function doOneMillionCalculationsAroundWholeCircle() { | |
var start = new Date(); | |
var result = 0; | |
for ( | |
var count = 0; | |
count < 1000000; | |
++count | |
) { | |
for ( | |
var angleDegrees = 0; | |
angleDegrees < 360; | |
++angleDegrees | |
) { | |
result = result + Math.sin(angleDegrees * ONE_DEGREE); | |
} | |
} | |
var end = new Date(); | |
var diff = end - start; | |
console.log(`Math.sin (ES5) result: ${result}`); | |
console.log(`Math.sin (ES5) time: ${diff}`); | |
} | |
}()); |
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