LibJS: Add Math.exp()

Libraries/LibJS/Tests/Math-constants.js

@@ -1,17 +1,14 @@
 load("test-common.js");
 
-// Borrowed from LibM/TestMath.cpp :^)
-function expectClose(a, b) { assert(Math.abs(a - b) < 0.000001); }
-
 try {
-    expectClose(Math.E, 2.718281);
-    expectClose(Math.LN2, 0.693147);
-    expectClose(Math.LN10, 2.302585);
-    expectClose(Math.LOG2E, 1.442695);
-    expectClose(Math.LOG10E, 0.434294);
-    expectClose(Math.PI, 3.1415926);
-    expectClose(Math.SQRT1_2, 0.707106);
-    expectClose(Math.SQRT2, 1.414213);
+    assert(isClose(Math.E, 2.718281));
+    assert(isClose(Math.LN2, 0.693147));
+    assert(isClose(Math.LN10, 2.302585));
+    assert(isClose(Math.LOG2E, 1.442695));
+    assert(isClose(Math.LOG10E, 0.434294));
+    assert(isClose(Math.PI, 3.1415926));
+    assert(isClose(Math.SQRT1_2, 0.707106));
+    assert(isClose(Math.SQRT2, 1.414213));
 
     console.log("PASS");
 } catch (e) {

Libraries/LibJS/Tests/Math.exp.js

@@ -0,0 +1,19 @@
+load("test-common.js");
+
+try {
+    assert(Math.exp.length === 1);
+
+    assert(Math.exp(0) === 1);
+    assert(isClose(Math.exp(-2), 0.135335));
+    assert(isClose(Math.exp(-1), 0.367879));
+    assert(isClose(Math.exp(1), 2.718281));
+    assert(isClose(Math.exp(2), 7.389056));
+
+    assert(isNaN(Math.exp()));
+    assert(isNaN(Math.exp(undefined)));
+    assert(isNaN(Math.exp("foo")));
+
+    console.log("PASS");
+} catch (e) {
+    console.log("FAIL: " + e);
+}

Libraries/LibJS/Tests/test-common.js

@@ -50,3 +50,11 @@ function assertThrowsError(testFunction, options) {
     }
 }
 
+/**
+ * Check whether the difference between two numbers is less than 0.000001.
+ * @param {Number} a First number
+ * @param {Number} b Second number
+ */
+function isClose(a, b) {
+    return Math.abs(a - b) < 0.000001;
+}