Use Math.cosh

src/ol/math.js

@@ -14,32 +14,6 @@ export function clamp(value, min, max) {
   return Math.min(Math.max(value, min), max);
 }
 
-/**
- * Return the hyperbolic cosine of a given number. The method will use the
- * native `Math.cosh` function if it is available, otherwise the hyperbolic
- * cosine will be calculated via the reference implementation of the Mozilla
- * developer network.
- *
- * @param {number} x X.
- * @return {number} Hyperbolic cosine of x.
- */
-export const cosh = (function () {
-  // Wrapped in a iife, to save the overhead of checking for the native
-  // implementation on every invocation.
-  let cosh;
-  if ('cosh' in Math) {
-    // The environment supports the native Math.cosh function, use it…
-    cosh = Math.cosh;
-  } else {
-    // … else, use the reference implementation of MDN:
-    cosh = function (x) {
-      const y = /** @type {Math} */ (Math).exp(x);
-      return (y + 1 / y) / 2;
-    };
-  }
-  return cosh;
-})();
-
 /**
  * Return the base 2 logarithm of a given number. The method will use the
  * native `Math.log2` function if it is available, otherwise the base 2

src/ol/proj/epsg3857.js

@@ -3,7 +3,6 @@
  */
 import Projection from './Projection.js';
 import Units from './Units.js';
-import {cosh} from '../math.js';
 
 /**
  * Radius of WGS84 sphere
@@ -54,7 +53,7 @@ class EPSG3857Projection extends Projection {
       global: true,
       worldExtent: WORLD_EXTENT,
       getPointResolution: function (resolution, point) {
-        return resolution / cosh(point[1] / RADIUS);
+        return resolution / Math.cosh(point[1] / RADIUS);
       },
     });
   }

test/node/ol/math.test.js

@@ -2,7 +2,6 @@ import expect from '../expect.js';
 import {
   ceil,
   clamp,
-  cosh,
   floor,
   lerp,
   log2,
@@ -37,28 +36,6 @@ describe('ol/math.js', () => {
     });
   });
 
-  describe('cosh', function () {
-    it('returns the correct value at -Infinity', function () {
-      expect(cosh(-Infinity)).to.eql(Infinity);
-    });
-
-    it('returns the correct value at -1', function () {
-      expect(cosh(-1)).to.roughlyEqual(1.5430806348152437, 1e-9);
-    });
-
-    it('returns the correct value at 0', function () {
-      expect(cosh(0)).to.eql(1);
-    });
-
-    it('returns the correct value at 1', function () {
-      expect(cosh(1)).to.roughlyEqual(1.5430806348152437, 1e-9);
-    });
-
-    it('returns the correct value at Infinity', function () {
-      expect(cosh(Infinity)).to.eql(Infinity);
-    });
-  });
-
   describe('log2', function () {
     it('returns the correct value at Infinity', function () {
       expect(log2(Infinity)).to.eql(Infinity);