Add lab 10 content

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

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+    Title: Lab Ten
+    Date: 2022-10-17T08:30:00
+    Tags: cs2613, lab, javascript, methods, tests, classes, prototypes, arrays, recursion
+
+In this lab, I learned about classes, prototypes, arrays and how to use recursion in javascript
+<!-- more -->
+
+## Methods
+
+## Prototypes
+
+## Classes
+
+## Arrays
+
+## Recursion

labs/L10/arrays.js

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+function range(start, end, step=1) {
+	let result = [];
+	for (let i = start; i <= end; i += step) {
+		result.push(i);
+	}
+	return result;
+}
+
+function sum(array) {
+	let result = 0;
+	for (let i = 0; i < array.length; i++) {
+		result += array[i];
+	}
+	return result;
+}
+
+exports.range = range;
+exports.sum = sum;

labs/L10/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;
+}
+
+exports.plus = plus;
+exports.mult = mult;

labs/L10/rec-arith.js

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+function plus(a,b) {
+	if (a === 0) {
+		return b;
+	} else {
+		return plus(a-1, b+1);
+	}
+}
+function mult(a,b) {
+	if (a === 0) {
+		return 0;
+	} else {
+		return plus(mult(a-1, b), b);
+	}
+}
+exports.plus = plus;
+exports.mult = mult;

labs/L10/spec/arrays.spec.js

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+let array=require("../arrays.js");
+
+describe("range", function () {
+    it("empty", function () {
+        expect(array.range(2,1)).toEqual([]);
+    });
+    it("single", function () {
+        expect(array.range(2,2)).toEqual([2]);
+    });
+    it("multiple", function () {
+        expect(array.range(42,50)).toEqual([42,43,44,45,46,47,48,49,50]);
+    });
+    it("step", function() {
+        expect(array.range(2,10,2)).toEqual([2,4,6,8,10]);
+    })
+});
+
+describe("sum", function () {
+    it("empty", function () {
+        expect(array.sum([])).toBe(0);
+    });
+    it("single", function () {
+        expect(array.sum([2])).toBe(2);
+    });
+    it("multiple", function () {
+        expect(array.sum(array.range(1,10))).toBe(55);
+    })
+    it("stepped", function() {
+        expect(array.sum(array.range(2,10,2))).toBe(30)
+    });    
+});

labs/L10/spec/rec_arith.spec.js

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+let arith=require ("../rec-arith.js");
+
+describe("plus",
+	 function() {
+		it("1 + 1 = 2",
+			function() {
+				expect(arith.plus(1, 1)).toBe(2);
+			});
+		 it("0 + x = x",
+			function() {
+				expect(arith.plus(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/L10/spec/rec_vs_loop.spec.js

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

labs/L10/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
+  }
+}

labs/L10/time.js

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+function timePlus(time1, time2) {
+    let mins = (time1.mins + time2.mins) % 60;
+    let hours = time1.hours + time2.hours + Math.floor((time1.mins+time2.mins)/60);
+    return {'hours': hours, 'mins': mins};
+}
+console.log(timePlus({hours: 10, mins:30}, {hours: 17, mins:47}));
+function maketime(hours, mins){
+    let plus=function (other) {
+        let raw=timePlus(this,other);
+        return maketime(raw.hours, raw.mins);
+    };
+
+    return { 'hours': hours, 'mins': mins, 'plus': plus};
+}
+
+let A=maketime(10, 30);
+let B=maketime(17, 47);
+let C=A.plus(B);
+console.log(C);
+
+let protoTime = {
+    plus: function(other) {
+        let raw=timePlus(this,other);
+        return timeNew(raw.hours, raw.mins);
+    }
+};
+
+function timeNew(hours, mins) {
+    let obj=Object.create(protoTime);
+    obj.hours = hours;
+    obj.mins = mins;
+    return obj;
+}
+
+D=timeNew(21,42);
+E=timeNew(17,37);
+
+F=D.plus(E);
+console.log(F);
+
+function Time(hours, mins){
+    this.hours=hours;
+    this.mins=mins;
+}
+
+Time.prototype.plus=function (other) {
+    let raw=timePlus(this,other);
+    return new Time(raw.hours, raw.mins);
+}
+
+G = new Time(20,59);
+H = new Time(11,11);
+
+I=G.plus(H);
+console.log(I);
+
+class Time2 {
+    constructor(hours, mins){
+        this.hours=hours;
+        this.mins=mins;
+    };
+    plus(other) {
+        let raw=timePlus(this,other);
+        return new Time2(raw.hours, raw.mins);
+    }
+}
+
+J= new Time2(5,30);
+K= new Time2(11,55);
+
+L=J.plus(K);
+console.log(L)