# 8

## JavaScript performance comparison

Revision 32 of this test case created by Rails Jack

## Preparation code

``````

<script>
Benchmark.prototype.setup = function() {
return deg * Math.PI / 180
}

Number.prototype.toRadians = function() { return this * Math.PI / 180; };
Number.prototype.toDegrees = function() { return this * 180 / Math.PI; };

};

</script>
``````

## Test runner

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Java applet disabled.

Testing in CCBot 2.0.0 / Other 0.0.0
Test Ops/sec
3
``````function distance(lat1, lon1, lat2, lon2) {
var R = 6371; // Radius of the earth in km
var dLat = (lat2 - lat1) * Math.PI / 180; // deg2rad below
var dLon = (lon2 - lon1) * Math.PI / 180;
var a =
0.5 - Math.cos(dLat) / 2 +
Math.cos(lat1 * Math.PI / 180) * Math.cos(lat2 * Math.PI / 180) *
(1 - Math.cos(dLon)) / 2;

return R * 2 * Math.atan2(Math.sqrt(a), Math.sqrt(1 - a));
}

distance(48, -122, 49, -121);``````
pending…
6
``````function distance(lat1, lon1, lat2, lon2) {
var deg2rad = 0.017453292519943295; // === Math.PI / 180
var cos = Math.cos;
var diam = 12742; // Diameter of the earth in km (2 * 6371)
var dLat = lat2 - lat1;
var dLon = lon2 - lon1;
var a = (
(1 - cos(dLat)) +
(1 - cos(dLon)) * cos(lat1) * cos(lat2)
) / 2;

return diam * Math.asin(Math.sqrt(a));
}

distance(48, -122, 49, -121);``````
pending…
4
``````function distance(lat1, lon1, lat2, lon2) {
var R = 6371; // Radius of the earth in km
var dLat = (lat2 - lat1) * Math.PI / 180; // deg2rad below
var dLon = (lon2 - lon1) * Math.PI / 180;
var a =
0.5 - Math.cos(dLat) / 2 +
Math.cos(lat1 * Math.PI / 180) * Math.cos(lat2 * Math.PI / 180) *
(1 - Math.cos(dLon)) / 2;

return R * 2 * Math.asin(Math.sqrt(a));
}

distance(48, -122, 49, -121);``````
pending…
7
``````function distance(lat1, lon1, lat2, lon2) {
var deg2rad = 0.017453292519943295; // === Math.PI / 180
var cos = Math.cos;
var a = (
(1 - cos(lat2 - lat1)) +
(1 - cos(lon2 - lon1)) * cos(lat1) * cos(lat2)
) / 2;

return 12742 * Math.asin(Math.sqrt(a)); // Diameter of the earth in km (2 * 6371)
}

distance(48, -122, 49, -121);``````
pending…
2
``````function distance(lat1, lon1, lat2, lon2) {
var R = 6371;
var dLat = deg2rad(lat2 - lat1);
var dLon = deg2rad(lon2 - lon1);
var a =
0.5 - Math.cos(dLat) / 2 +
(1 - Math.cos(dLon)) / 2;

return R * 2 * Math.atan2(Math.sqrt(a), Math.sqrt(1 - a));
}

distance(48, -122, 49, -121);``````
pending…
8
``````function distance(lat1, lon1, lat2, lon2){
var R = 6371e3; // metres

var a = Math.sin(Δφ/2) * Math.sin(Δφ/2) +
Math.cos(φ1) * Math.cos(φ2) *
Math.sin(Δλ/2) * Math.sin(Δλ/2);
var c = 2 * Math.atan2(Math.sqrt(a), Math.sqrt(1-a));

return R * c / 1000;
}

distance(48, -122, 49, -121);``````
pending…
5
``````function distance(lat1, lon1, lat2, lon2) {
var deg2rad = Math.PI / 180;
var diam = 12742; // Diameter of the earth in km (2 * 6371)
var dLat = lat2 - lat1;
var dLon = lon2 - lon1;
var a = (
(1 - Math.cos(dLat)) +
(1 - Math.cos(dLon)) * Math.cos(lat1) * Math.cos(lat2)
) / 2;

return diam * Math.asin(Math.sqrt(a));
}

distance(48, -122, 49, -121);``````
pending…
1
``````function distance(lat1, lon1, lat2, lon2) {
var R = 6371; // Radius of the earth in km
var dLon = deg2rad(lon2 - lon1);
var a =
Math.sin(dLat / 2) * Math.sin(dLat / 2) +
Math.sin(dLon / 2) * Math.sin(dLon / 2);

var c = 2 * Math.atan2(Math.sqrt(a), Math.sqrt(1 - a));
var d = R * c; // Distance in km
return d;
}

distance(48, -122, 49, -121);``````
pending…

## Revisions

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