loops discussion

Author: nainimaru

05_iterations/eight.js

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+//reduce
+
+const myNums = [1, 2, 3]
+
+// const myTotal = myNums.reduce(function (acc, currval) {
+//     console.log(`acc: ${acc} and currval: ${currval}`);
+//     return acc + currval
+// }, 0)
+
+const myTotal = myNums.reduce( (acc, curr) => acc+curr, 0)
+
+console.log(myTotal);
+
+
+const shoppingCart = [
+    {
+        itemName: "js course",
+        price: 2999
+    },
+    {
+        itemName: "py course",
+        price: 999
+    },
+    {
+        itemName: "mobile dev course",
+        price: 5999
+    },
+    {
+        itemName: "data science course",
+        price: 12999
+    },
+]
+
+const priceToPay = shoppingCart.reduce((acc, item) => acc + item.price, 0)
+
+console.log(priceToPay);

05_iterations/five.js

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+//for each
+
+const coding = ["js", "ruby", "java", "python", "cpp"]
+
+// coding.forEach( function (val){
+//     console.log(val);
+// } )
+
+// coding.forEach( (item) => {
+//     console.log(item);
+// } )
+
+// function printMe(item){
+//     console.log(item);
+// }
+
+// coding.forEach(printMe)
+
+// coding.forEach( (item, index, arr)=> {
+//     console.log(item, index, arr);
+// } )
+
+const myCoding = [
+    {
+        languageName: "javascript",
+        languageFileName: "js"
+    },
+    {
+        languageName: "java",
+        languageFileName: "java"
+    },
+    {
+        languageName: "python",
+        languageFileName: "py"
+    },
+]
+
+myCoding.forEach( (item) => {
+    
+    console.log(item.languageName);
+} )

05_iterations/four.js

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+//for in
+
+const myObject = {
+    js: 'javascript',
+    cpp: 'C++',
+    rb: "ruby",
+    swift: "swift by apple"
+}
+
+for (const key in myObject) {
+    //console.log(`${key} shortcut is for ${myObject[key]}`);
+}
+
+const programming = ["js", "rb", "py", "java", "cpp"]
+
+for (const key in programming) {
+    //console.log(programming[key]);           
+}
+
+// const map = new Map()
+// map.set('IN', "India")
+// map.set('USA', "United States of America")
+// map.set('Fr', "France")
+// map.set('IN', "India")
+
+// for (const key in map) {
+//     console.log(key);
+// }                                  // for in wont run in maps

05_iterations/one.js

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+// for loop
+
+for (let i = 0; i <= 10; i++) {
+    const element = i;
+    if (element == 5) {
+        //console.log("5 is best number");
+    }
+    //console.log(element);
+    
+}
+
+// console.log(element);     //not accesible
+
+for (let i = 1; i <= 10; i++) {
+    //console.log(`Outer loop value: ${i}`);
+   for (let j = 1; j <= 10; j++) {
+    //console.log(`Inner loop value ${j} and inner loop ${i}`);
+    //console.log(i + '*' + j + ' = ' + i*j );
+   }
+    
+}
+let myArray = ["flash", "batman", "superman"]
+//console.log(myArray.length);
+for (let index = 0; index < myArray.length; index++) {
+    const element = myArray[index];
+    //console.log(element);
+    
+}
+
+
+
+// break and continue
+
+// for (let index = 1; index <= 20; index++) {
+//     if (index == 5) {
+//         console.log(`Detected 5`);
+//         break
+//     }
+//    console.log(`Value of i is ${index}`);
+    
+// }
+
+for (let index = 1; index <= 20; index++) {
+    if (index == 5) {
+        console.log(`Detected 5`);
+        continue
+    }
+   console.log(`Value of i is ${index}`);
+    
+}

05_iterations/seven.js

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+const myNumers = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]
+
+// const newNums = myNumers.map( (num) => { return num + 10})
+
+const newNums = myNumers
+                .map((num) => num * 10 )
+                .map( (num) => num + 1)
+                .filter( (num) => num >= 40)
+
+console.log(newNums);

05_iterations/six.js

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+//filter
+
+// const coding = ["js", "ruby", "java", "python", "cpp"]
+
+
+// const values = coding.forEach( (item) => {
+//     //console.log(item);
+//     return item
+// } )
+
+// console.log(values);
+
+const myNums = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]
+
+// const newNums = myNums.filter( (num) => {
+//     return num > 4
+// } )
+
+// const newNums = []
+
+// myNums.forEach( (num) => {
+//     if (num > 4) {
+//         newNums.push(num)
+//     }
+// } )
+
+// console.log(newNums);
+
+
+const books = [
+    { title: 'Book One', genre: 'Fiction', publish: 1981, edition: 2004 },
+    { title: 'Book Two', genre: 'Non-Fiction', publish: 1992, edition: 2008 },
+    { title: 'Book Three', genre: 'History', publish: 1999, edition: 2007 },
+    { title: 'Book Four', genre: 'Non-Fiction', publish: 1989, edition: 2010 },
+    { title: 'Book Five', genre: 'Science', publish: 2009, edition: 2014 },
+    { title: 'Book Six', genre: 'Fiction', publish: 1987, edition: 2010 },
+    { title: 'Book Seven', genre: 'History', publish: 1986, edition: 1996 },
+    { title: 'Book Eight', genre: 'Science', publish: 2011, edition: 2016 },
+    { title: 'Book Nine', genre: 'Non-Fiction', publish: 1981, edition: 1989 },
+  ];
+
+  let userBooks = books.filter( (bk) => bk.genre === 'History')
+
+  userBooks = books.filter( (bk) => { 
+    return bk.publish >= 1995 && bk.genre === "History"
+})
+  console.log(userBooks); 

05_iterations/three.js

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+// for of
+
+// ["", "", ""]
+// [{}, {}, {}]
+
+const arr = [1, 2, 3, 4, 5]
+
+for (const num of arr) {
+    //console.log(num);
+}
+
+const greetings = "Hello world!"
+for (const greet of greetings) {
+    //console.log(`Each char is ${greet}`)
+}
+
+// Maps
+
+const map = new Map()
+map.set('IN', "India")
+map.set('USA', "United States of America")
+map.set('Fr', "France")
+map.set('IN', "India")
+
+
+// console.log(map);
+
+for (const [key, value] of map) {
+    // console.log(key, ':-', value);
+}
+
+const myObject = {
+    game1: 'NFS',
+    game2: 'Spiderman'
+}
+
+// for (const [key, value] of myObject) {
+//     console.log(key, ':-', value);
+    
+// }    //for of wont run for objects, not iterable like this

05_iterations/two.js

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+let index = 0
+// while (index <= 10) {
+//     console.log(`Value of index is ${index}`);
+//     index = index + 2
+// }
+
+let myArray = ['flash', "batman", "superman"]
+
+let arr = 0
+while (arr < myArray.length) {
+    //console.log(`Value is ${myArray[arr]}`);
+    arr = arr + 1
+}
+
+
+
+let score = 11
+
+do {
+    console.log(`Score is ${score}`);
+    score++
+} while (score <= 10);