Add lab 9 content

.gitignore

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-*.bak
+*.bak
+.nyc_output

journal/_src/posts/2022-09-28-lab-nine.md

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+    Title: Lab Nine
+    Date: 2022-10-12T08:30:00
+    Tags: cs2163, lab, javascript,
+
+TBD
+<!-- more -->
+
+TBD

labs/L09/loop-arith.js

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+function plus(a,b) {
+    for (let i=0; i < a; i++){
+        b++;
+    }
+    return b;
+}
+
+function mult(a,b) {
+    sum=0;
+	for(let i=0; i < a; i++) {
+		sum = plus(sum, b)
+	}
+    return sum;
+}
+
+function minus(a,b) {
+    for (let i=0; i < a; i++){
+        b--;
+    }
+    return b;
+}
+
+exports.plus = plus;
+exports.mult = mult;
+exports.minus = minus;

labs/L09/minus.js

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+let arith=require("./loop-arith.js");
+
+console.log(arith.minus(10,0));

labs/L09/spec/builtins.spec.js

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+describe("identity",
+function() {
+	it("1 === 1", function() { expect(1).toBe(1); });
+	it("null === null", function() { expect(null).toBe(null); })
+});
+
+describe("arithmetic",
+function() {
+	it("1 + 1 === 2", function() { expect(1 + 1).toBe(2); });
+	it("6 * 7  === 42", function() { expect(6*7).toBe(42); });
+});

labs/L09/spec/loop-arith.spec.js

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+let arith=require ("../loop-arith.js");
+
+describe("add",
+	 function() {
+		it("1 + 1 = 2",
+			function() {
+				expect(arith.add(1, 1)).toBe(2);
+			});
+		 it("0 + x = x",
+			function() {
+				expect(arith.add(0, 1)).toBe(1);
+			});
+	});
+
+describe("mult",
+	 function() {
+		 it("0 * 2 = 0",
+		 	function() {
+				expect(arith.mult(0, 2)).toBe(0);
+			});
+
+		 it("1 * 2 = 2",
+			function() {
+				expect(arith.mult(1,2)).toBe(2);
+			});
+		 it("2 * 2 = 4",
+			function() {
+				expect(arith.mult(2, 2)).toBe(4)
+			});
+	 });

labs/L09/spec/support/jasmine.json

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+{
+  "spec_dir": "spec",
+  "spec_files": [
+    "**/*[sS]pec.?(m)js"
+  ],
+  "helpers": [
+    "helpers/**/*.?(m)js"
+  ],
+  "env": {
+    "stopSpecOnExpectationFailure": false,
+    "random": true
+  }
+}