Completed classes exercises

01_Day_JavaScript_Refresher/01_javascript_refresher/Class Exercises/level1&2.js

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+class Animal {
+    constructor(name, age, color, legs) {
+        this.name = name;
+        this.age = age;
+        this.color = color;
+        this.legs = legs;
+    }
+    
+    // getter's and setter are quite trivial so decided not to make them for this refresher
+    
+    info() {
+        return `The animal's name is ${this.name}`;
+    }
+}
+
+class Dog extends Animal {
+    constructor(name, age, color) {
+        super(name, age, color, 4);
+    }
+
+    info() {
+        return `The dog's name is ${this.name}`;
+    }
+}
+// Cat and dog are also very similar

01_Day_JavaScript_Refresher/01_javascript_refresher/Class Exercises/level3.js

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+class statistics {
+    static setData(data) {
+        this.data = data;
+    }
+
+    static count() {
+        return this.data.length;
+    }
+
+    static sum() {
+        return this.data.reduce((acc, cur) => acc + cur)
+    }
+
+    static min() {
+        let min = this.data[0];
+        this.data.forEach(item => {
+            if (min > item) {
+                min = item;
+            }
+        });
+        return min;
+    }
+
+    static max() {
+        let max = this.data[0];
+        this.data.forEach(item => {
+            if (max < item) {
+                max = item;
+            }
+        });
+        return max;
+    }
+
+    static range() {
+        return this.max() - this.min();
+    }
+
+    static mean() {
+        return this.sum() / this.count();
+    }
+
+    static median() {
+        const sorted = this.data.sort();
+        if (this.count() % 2 == 0) {
+            return (sorted[this.count()/2] + sorted[(this.count()/2)-1]) / 2; // -1 due to 0 indexing
+        } else {
+            return sorted[Math.floor(this.count()/2)];
+        }
+    }
+
+    static mode() {
+        let values = {};
+        let max = this.data[0];
+        this.data.forEach(d => {
+            if (values[d] == undefined) {
+                values[d] = 0;
+            }
+            values[d] += 1;
+            if (values[d] > values[max]) {
+                max = d;
+            }
+        });
+        return max;
+    }
+
+    // decided to stop here as seems very repetetive as refresher task
+}
+
+ages = [31, 26, 34, 37, 27, 26, 32, 32, 26, 27, 27, 24, 32, 33, 27, 25, 26, 38, 37, 31, 34, 24, 33, 29, 26]
+statistics.setData(ages);
+
+console.log('Count:', statistics.count()) // 25
+console.log('Sum: ', statistics.sum()) // 744
+console.log('Min: ', statistics.min()) // 24
+console.log('Max: ', statistics.max()) // 38
+console.log('Range: ', statistics.range()) // 14
+console.log('Mean: ', statistics.mean()) // 29.76
+console.log('Median: ',statistics.median()) // 29
+console.log('Mode: ', statistics.mode()) // {'mode': 26, 'count': 5}
+console.log('Variance: ',statistics.var()) // 17.5
+console.log('Standard Deviation: ', statistics.std()) // 4.2
+console.log('Variance: ',statistics.var()) // 17.5
+console.log('Frequency Distribution: ',statistics.freqDist()) // [(20.0, 26), (16.0, 27), (12.0, 32), (8.0, 37), (8.0, 34), (8.0, 33), (8.0, 31)