Task4

Task4/question1.js

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+// http://www.codewars.com/kata/using-closures-to-share-class-state
+
+var totalWeight = 0,
+    count = 0;
+var Cat = function(name, weight) {
+
+    if (!name && !weight)
+        throw Error;
+
+    this.name = name;
+    totalWeight += weight;
+    count++;
+
+    Object.defineProperty(this, 'weight', {
+        get: function() { return weight; },
+        set: function(value) {
+            totalWeight -= weight;
+            totalWeight += value;
+            weight = value;
+        }
+    })
+
+};
+
+Cat.averageWeight = function() {
+    return totalWeight / count;
+}

Task4/question2.js

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+// http://www.codewars.com/kata/a-chain-adding-function
+
+function add(n) {
+    let tempfunc = function(number) {
+        return add(number + n);
+    }
+    tempfunc.valueOf = function() {
+        return n;
+    }
+    return tempfunc;
+}

Task4/question3.js

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+// http://www.codewars.com/kata/function-cache
+
+function cache(func) {
+
+    var obj = {}
+    var arr = new Array();
+    return function(arg1, arg2) {
+        let arr1 = new Array();
+        arr1.push(arg1);
+        arr1.push(arg2);
+
+        let strArr1 = JSON.stringify(arr1);
+        if (!(arr.includes(strArr1))) {
+            arr.push(strArr1);
+            obj[strArr1] = func(arg1, arg2);
+            return obj[strArr1];
+        } else {
+            return obj[strArr1];
+        }
+    }
+}

Task4/question4.js

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+// http://www.codewars.com/kata/function-composition
+
+function compose(f, g) {
+    // Compose the two functions here!
+    return function(...args) {
+        return f(g(...args))
+    }
+}

Task4/question5.js

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+// http://www.codewars.com/kata/function-composition-1
+
+function compose(...args) {
+    return function(num) {
+        for (let i = args.length - 1; i >= 0; i--) {
+            num = args[i](num);
+        }
+        return num;
+    }
+}