LibJS: Add Math.exp()

Author: https://github.com/linusg
Commit: e375766f98
Pull-request: https://github.com/SerenityOS/serenity/pull/2285

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);
+}