Completed Object and Function exercises

2 years ago · 7eaf91323a
parent aaf7f36556
commit 7eaf91323a
3 changed files with 116 additions and 2 deletions
--- a/01_Day_JavaScript_Refresher/01_javascript_refresher/Function
+++ b/01_Day_JavaScript_Refresher/01_javascript_refresher/Function
@ -0,0 +1,8 @@
+<html>
+    <head>
+
+    </head>
+    <body>
+        <script src="./level3.js"></script> 
+    </body>    
+</html>
--- a/01_Day_JavaScript_Refresher/01_javascript_refresher/Function
+++ b/01_Day_JavaScript_Refresher/01_javascript_refresher/Function
@ -0,0 +1,80 @@
+function userIdGeneratedByUser() {
+    const charCount = prompt("Number of characters");
+    const idCount = prompt("Number of ids");
+    const allIDs = [];
+    const chars = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789";
+    for (let i = 0; i < idCount; i++) {
+        allIDs.push(userIdGenerator(chars, charCount));
+    }
+
+}
+
+// The program has been adapted from level2.js
+function userIdGenerator(availChars, charCount) {
+    result = "";
+    for (let i = 0; i < charCount; i++) {
+        result += availChars[Math.floor(Math.random() * availChars.length)];
+    }
+    console.log(result);
+    return result;
+}
+
+function generateColors(type, amount) {
+    const toReturn = [];
+    const chars = "0123456789abcdef";
+    switch (type) {
+        case "hexa":
+            for (let i = 0; i < amount; i++) {
+                toReturn.push(`#${userIdGenerator(chars, 6)}`);
+            }
+            break;
+        case "rgb":
+            for (let i = 0; i < amount; i++) {
+                toReturn.push(`rgb(${Math.floor(Math.random()*256)}, ${Math.floor(Math.random()*256)}, ${Math.floor(Math.random()*256)})`);
+            }
+            break;
+    }
+    return toReturn.toString();
+}
+
+function shuffleArray(arr) {
+    let newArr = [];
+    let length = 0;
+    arr.forEach(element => {
+        newArr = newArr.insert(element, Math.floor(Math.random() * newArr.length));
+    });
+    return newArr;
+}
+
+Array.prototype.insert = function(value, index){
+    console.log(value, index.toString());
+    return [...this.slice(0,index), value, ...this.slice(index)];
+}
+
+function factorial(value) {
+    if (value == 0) {
+        return 1;
+    }
+    return value * factorial(value-1);
+}
+
+function isEmpty(param) {
+    return value === undefined || value === null || value === '';
+}
+
+function average(array) {
+    let sum = 0;
+    array.forEach(elem => {
+        if (elem == Number) {
+            sum += elem;
+        } else {
+            console.log("Sorry the array is not fully numerical");
+            return;
+        }
+    });
+    return sum / array.length;
+}
+// userIdGeneratedByUser();
+// console.log(generateColors("hexa",20));
+// console.log(shuffleArray([1,2,3,4,5,6,7,8,9,10]))
+console.log(factorial(3));
--- a/01_Day_JavaScript_Refresher/01_javascript_refresher/Object
+++ b/01_Day_JavaScript_Refresher/01_javascript_refresher/Object
@ -155,6 +155,32 @@ function rateProduct(userID, productID, rating) {
    console.log("There is no such product");
 }

-function averageRating() {
+function averageRating(productID) {
+    products.forEach(product => {
+        if (product._id == productID) {
+            return product.ratings.average();
+        }
+    })
+}

+product.ratings.average = function() {
+    sum = 0;
+    this.forEach(rating => {
+        sum += rating;
+    });
+    sum = sum / this.length;
+    return sum;
+}
+
+function likeProduct(userID, productID) {
+    products.forEach(product => { // i realise this is not the most efficient way to find the product with the correect ID
+        if (product._id == productID) {
+            if (product.likes.find(userID) == -1) {
+                product.likes.push(userID);    
+            } else {
+                product.likes.splice(product.likes.find(userID),1);
+            }
+            
+        }
+    })
 }