From f84a501933cd562bade2ea2ec19593453729b7cc Mon Sep 17 00:00:00 2001
From: yikth <netyth@gmail.com>
Date: Wed, 2 Sep 2020 11:25:05 +0800
Subject: [PATCH] add sample code for object & JSON

---
 JavaScriptBasics/arrayMethods.js      | 24 ++++++++++++++++++++----
 JavaScriptBasics/functions.js         |  5 +++++
 JavaScriptBasics/loops.js             | 24 ++++++++++++++++++++++++
 jsObjectsAndJSON/methods.js           | 14 ++++++++++++++
 jsObjectsAndJSON/objectArray.js       | 23 +++++++++++++++++++++++
 jsObjectsAndJSON/objectArrayModify.js | 20 ++++++++++++++++++++
 jsObjectsAndJSON/objectArraytoJSON.js | 24 ++++++++++++++++++++++++
 jsObjectsAndJSON/objects.js           | 21 +++++++++++++++++++++
 8 files changed, 151 insertions(+), 4 deletions(-)
 create mode 100644 JavaScriptBasics/loops.js
 create mode 100644 jsObjectsAndJSON/methods.js
 create mode 100644 jsObjectsAndJSON/objectArray.js
 create mode 100644 jsObjectsAndJSON/objectArrayModify.js
 create mode 100644 jsObjectsAndJSON/objectArraytoJSON.js
 create mode 100644 jsObjectsAndJSON/objects.js

diff --git a/JavaScriptBasics/arrayMethods.js b/JavaScriptBasics/arrayMethods.js
index 68158b7..114a4d0 100644
--- a/JavaScriptBasics/arrayMethods.js
+++ b/JavaScriptBasics/arrayMethods.js
@@ -8,14 +8,30 @@ console.log(accDetails);
 console.log("My account balance is: $" + accDetails[1]);
 
 //add/delete at the end
-console.log("pop :"); names.pop(); console.log(names);
-console.log("push :"); names.push('James'); console.log(names);
+console.log("pop :"); 
+names.pop(); 
+console.log(names);
+
+console.log("push :"); 
+names.push('James'); 
+console.log(names);
 
 //add at the end and delete from the front
-console.log("shift :"); names.shift(); console.log(names);
-console.log("unshift :"); names.unshift('Lim'); console.log(names);
+console.log("shift :"); 
+names.shift(); 
+console.log(names);
+
+console.log("unshift :"); 
+names.unshift('Lim'); 
+console.log(names);
+
 //add/delete at middle
+console.log("splice :"); 
 console.log(names.splice(1, 1, ["Lim", "jenny"]));
 
+console.log("splice name :", names);
+console.log("splice name1 :", names[2]); 
+
+
 
 
diff --git a/JavaScriptBasics/functions.js b/JavaScriptBasics/functions.js
index 51e81ee..19492ba 100644
--- a/JavaScriptBasics/functions.js
+++ b/JavaScriptBasics/functions.js
@@ -23,3 +23,8 @@ let futureValueAF = (principle, rate, years, ci =2) => { //Arrow Function
 }
 console.log(futureValueAF(10000, 3, 5, 1).toFixed(2));
 
+// formulate single line arrow function for single line return
+let futureValueAF1 = (principle, rate, years, ci =2) => (principle * (1 + rate/100/ci)**(ci * years));
+
+console.log(futureValueAF1(10000, 3, 5, 1).toFixed(2));
+
diff --git a/JavaScriptBasics/loops.js b/JavaScriptBasics/loops.js
new file mode 100644
index 0000000..3d35a2d
--- /dev/null
+++ b/JavaScriptBasics/loops.js
@@ -0,0 +1,24 @@
+var banks = ["DBS", "HSBC", "OCBC", "UOB"];  //Array
+/*for (i=0; i<banks.length; i++) {
+    console.log(banks[i]);
+  }
+*/
+/*
+  let myFunction = function(item, index) {   //iterate through the listof items
+    console.log(`${item} is at index ${index}` );
+}
+
+banks.forEach(myFunction);  //forEach takes a CallBackFunction
+*/
+
+
+banks.forEach(function (item, index) {   // LOOP
+  console.log(`${item} is at index ${index}`); 
+});
+
+
+//using the last parameter
+banks.forEach(function (item, index, arr) {
+  console.log("Using Array Index")
+  console.log(arr[index]);
+});
diff --git a/jsObjectsAndJSON/methods.js b/jsObjectsAndJSON/methods.js
new file mode 100644
index 0000000..02701ae
--- /dev/null
+++ b/jsObjectsAndJSON/methods.js
@@ -0,0 +1,14 @@
+var account = {
+    acountNo:"ADB3256", 
+    name:"James", 
+    type:"savings", 
+    balance: 500,
+    
+    deposit: function(amt){
+        this.balance = this.balance + amt;
+    }
+
+};
+
+account.deposit(100);
+console.log(account.balance);
\ No newline at end of file
diff --git a/jsObjectsAndJSON/objectArray.js b/jsObjectsAndJSON/objectArray.js
new file mode 100644
index 0000000..923e0df
--- /dev/null
+++ b/jsObjectsAndJSON/objectArray.js
@@ -0,0 +1,23 @@
+//Searchig in an array of objects
+var expenses = [{
+    type :"Education", 
+    amount : 2000,
+}, { 
+    type:"Eating Out", 
+    amount : 600, 
+}, {
+    type: "Entertainment",
+    amount : 500,
+}];
+
+
+console.log(expenses[1]);
+console.log(expenses[2].amount);
+
+const fnSearch = expenses.findIndex(function(item, index){
+    console.log(item);
+    console.log(index);
+    //return item.type === "Eating Out";
+});
+//fnSearch = 3;
+//console.log(fnSearch);
diff --git a/jsObjectsAndJSON/objectArrayModify.js b/jsObjectsAndJSON/objectArrayModify.js
new file mode 100644
index 0000000..2149052
--- /dev/null
+++ b/jsObjectsAndJSON/objectArrayModify.js
@@ -0,0 +1,20 @@
+//Searchig in an array of objects
+var expenses = [{
+    type :"Education", 
+    amount : 2000,
+}, { 
+    type:"Eating Out", 
+    amount : 600, 
+}, {
+    type: "Entertainment",
+    amount : 500,
+}];
+
+const fnSearch = expenses.findIndex(function(item, index, exp){
+    if (item.type === "Eating Out") {
+        //exp[index].amount = 700;
+        item.amount = 700;
+    }
+});
+
+console.log(expenses);
diff --git a/jsObjectsAndJSON/objectArraytoJSON.js b/jsObjectsAndJSON/objectArraytoJSON.js
new file mode 100644
index 0000000..8c642f5
--- /dev/null
+++ b/jsObjectsAndJSON/objectArraytoJSON.js
@@ -0,0 +1,24 @@
+//Searchig in an array of objects
+var bankbal = [{
+    bname :"DBS", 
+    amount : 20000,
+}, { 
+    bname:"OCBC", 
+    amount : 6000, 
+}, {
+    bname: "UOB",
+    amount : 5000,
+}];
+
+const bankbalJSONstring = JSON.stringify(bankbal[0]);
+
+const backtoObj = JSON.parse(bankbalJSONstring);
+console.log(bankbal[0]);
+console.log(bankbalJSONstring);
+console.log(backtoObj);
+
+var a = ["DBS:10000", "HSBC:20000"];
+const aJSON = JSON.stringify(a);
+console.log(a);
+console.log(aJSON);
+
diff --git a/jsObjectsAndJSON/objects.js b/jsObjectsAndJSON/objects.js
new file mode 100644
index 0000000..d5fea5a
--- /dev/null
+++ b/jsObjectsAndJSON/objects.js
@@ -0,0 +1,21 @@
+//objects
+var account = {
+    acountNo:"ADB3256", 
+    name:"James", 
+    type:"savings", 
+    balance: 500
+};
+console.log("Account Number:" + account.acountNo);
+console.log("Account Balance:" + account.balance);
+
+//object members can be object
+myObj = {
+    "name":"John",
+    "age":30,
+    "cars": {
+      "car1":"Ford",
+      "car2":"BMW",
+      "car3":"Fiat"
+    }
+   }
+console.log(myObj.cars.car1);