add sample Javascript Basic code

JavaScriptBasics/arrayMethods.js

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+var names = ['Tom','Peter','Mary'];
+var name_string = names.join(',');
+console.log(name_string);
+
+myArray_string = "ABS Bank, 7000.00, true, Savings Account";
+var accDetails = myArray_string.split(','); 
+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);
+
+//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);
+//add/delete at middle
+console.log(names.splice(1, 1, ["Lim", "jenny"]));
+
+
+

JavaScriptBasics/arrays.js

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+/* A short demo for arrays */
+var myArray = ["ABS Bank", 7000.00, true, 'Savings Account'];
+console.log("Your bank: " + myArray[0]);
+console.log('You have mede a transaction today: ' + myArray[2]);
+console.log('Array size:' + myArray.length);
+//Arrays can contain arrays as members. (2D arrays - Table)
+var grocery_list = [[5,'egg'],[10,'bread'],[12,'milk']];
+ 
+
+console.log(grocery_list[2][1]); // returns 'milk', 2nd item of 3rd array 

JavaScriptBasics/functions.js

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+//let a = 10; defining a funtion has similar syntax
+let depositIntRates = function() {
+    console.log("3% for first $10000");
+    console.log("3.5% for amount greater than 10000");
+}
+depositIntRates();
+
+let futureValue = function(principle, rate, years, ci =2) { //ci - Number of Times interest is Compounded per period (or year)
+    rate = rate/100;
+    return (principle * (1 + rate/ci)**(ci * years));
+}
+var ans = futureValue(10000, 3, 5, 1).toFixed(2);
+console.log(ans);
+
+var a = 10.32324;
+console.log(a/2);
+console.log((a/2).toFixed(2));
+//console.log(b);
+
+let futureValueAF = (principle, rate, years, ci =2) => { //Arrow Function 
+    rate = rate/100;
+    return (principle * (1 + rate/ci)**(ci * years));
+}
+console.log(futureValueAF(10000, 3, 5, 1).toFixed(2));
+

JavaScriptBasics/functionsOldStyle.js

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+//function without argument
+function depositIntRates() {
+    console.log("3% for first $10000");
+    console.log("3.5% for amount greater than 10000");
+ }
+ depositIntRates();
+ 
+ //function with arguments
+ function calcInterest(amount) {  5000
+    var interest = 0;
+    var balance = 0;
+    if (amount > 10000) {
+            balance = amount - 10000; 
+    }
+    int = 10000 * .03 + balance * 0.035;
+    return (int);
+ }
+
+ var output = calcInterest(20000);
+ console.log(output);