update arraymethod and ieteratbles

5.4ArrayMethod/t.js

@@ -89,13 +89,92 @@ console.log(numbers.reduceRight((sum, cur) => sum + cur, 0));
 console.log(Array.isArray(countries))
 
 function camelize(str){
-    words = str.split('-')
+    // words = str.split('-')
-    for(let i = 1; i < words.length; i++){
+    // for(let i = 1; i < words.length; i++){
-        words[i][0] = words[i][0].toUpperCase();
+    //     words[i] = words[i][0].toUpperCase() + words[i].slice(1);
-        console.log(words[i])
+    // }
-    }
+    // return words.join('');
-    return words.join('');
+    return str.split('-')
+    .map((word, index) => index == 0 ? word: word[0].toUpperCase() + word.slice(1))
+    .join('')
 }
 console.log(camelize("background-color"))
 console.log(camelize("list-style-image"))
-console.log(camelize("-webkit-translation"))
+console.log(camelize("-webkit-translation"))
+
+function filterRange(arr, a, b){
+    return arr.filter(ele => ele >= a && ele <= b);
+}
+arr = [5, 3, 8, 1];
+let filtered = filterRange(arr, 1, 4);
+console.log(filtered)
+console.log(arr)
+
+
+function copySorted(arr){
+    return arr.slice().sort();
+}
+arr = ["HTML", "JavaScript", "CSS"];
+
+let sorted = copySorted(arr);
+console.log(sorted)
+console.log(arr)
+
+function Calculator(){
+    this.methods = {
+        "-": (a,b) => a-b,
+        "+": (a,b) => a+b
+    };
+    this.calculate = function(str){
+        let split = str.split(' ');
+        a = +split[0];
+        op = split[1];
+        b = +split[2];
+
+        if (!this.methods[op] || isNaN(a) || isNaN(b)){
+            return NaN;
+        }
+
+        return this.methods[op](a,b);
+    }
+    this.addMethod = function(name, func){
+        this.methods[name] = func;
+    }
+}
+let john = { name: "John", surname: "Smith", id: 25 };
+let pete = { name: "Pete", surname: "Hunt", id: 30 };
+let mary = { name: "Mary", surname: "Key", id: 28 };
+
+users = [ john, pete, mary ];
+
+names = users.map((user) => user.name)
+
+console.log( names ); // John, Pete, Mary
+
+let usersMapped = users.map((user) => {
+    return {
+        fullName: user.name + ' ' + user.surname, 
+        id: user.id
+    }
+}
+);
+console.log(usersMapped[0].id)
+console.log(usersMapped[0].fullName)
+
+function sortByAge(arr){
+    return arr.sort((userA, userB) => userA.id - userB.id)
+}
+
+
+sortByAge(users)
+console.log(users[0].name)
+console.log(users[1].name)
+console.log(users[2].name)
+
+function getAverageAge(arr){
+    return arr.reduce(function(sum, cur){
+        sum = sum + cur.id;
+    },0) / arr.length;
+}
+
+console.log(getAverageAge(users))

5.5Iterables/t.js

@@ -53,3 +53,6 @@ console.log(arr_s);
 console.log(arr_s[0]);
 console.log(arr_s[1]);
 console.log(arr_s.length);
+
+
+