08 Numbers and Maths in JS

Learned about Number in JS and what are the methods related to numbers, learned about Maths in JS and Methods related to maths.

Author: aayushyadavz

01_Basics/06_stackAndHeap.js

@@ -8,7 +8,9 @@ let anotherName = myYoutubeName // This will have the copy value of myYoutubeNam
 anotherName = "amanyadavz" // It's value will go in stack.
 console.log(myYoutubeName); // Output : ayushyadavz (Original value did not change)
 console.log(anotherName); // Output : amanyadavz (Only Copy value is changed)
-// So, here we have changed the copy not the original value.
+/* So, here we have changed the copy not the original value.
+
+---------------------------------------------------------------------------------------- */
 
 // Example of Heap,
 let userOne = { // UserOne will go into Stack. (Primitive)

01_Basics/07_strings.js

@@ -1,14 +1,16 @@
-// 7. Strings
+/* 7. Strings
 
-// (i) Concatenation in Strings,
+(i) Concatenation in Strings, */
 const name = "Ayush"
 const repoCount = 19
 // Outdated Syntax,
 console.log(name + repoCount + " etc."); // Output : Ayush19 etc.
 // Modern day Syntax,
 console.log(`My name is ${name} and I have total ${repoCount} repositories on GiHub.`);
 // Output : My name is Ayush and I have total 19 repositories on GiHub.
-// Note: Benifits of this syntax is that we can use methods like, ${name.toUpperCase} e.t.c.
+/* Note: Benifits of this syntax is that we can use methods like, ${name.toUpperCase} e.t.c.
+
+-------------------------------------------------------------------------------------------------- */
 
 // (ii) One more way of declaring strings,
 const gameName = new String('SuperMario') /* When we run this in Browser's console we can see

01_Basics/08_nums_and_maths.js

@@ -0,0 +1,55 @@
+/* 8. Numbers And Maths
+
+(i) Numbers, 
+When Javascript automatically defines the data type, */
+const balance = 400
+// console.log(balance); // Output: 400
+// Note: Here Javascript automatically detected that the score type is number.
+
+// But we can also define explicitely the data type,
+const newBalance = new Number(400)
+// console.log(newBalance); // Output: [Number: 400]
+// Note: When we do this in browser console the we can see the methods. 
+
+// ---------------------------------------------------------------------------------------------------------
+
+// Some Methods,
+// console.log(newBalance.toString()); // Output: 400 
+// Note: When we will check it's typeof the we will see that it is changed into strings.
+// console.log(newBalance.toString().length); // Output: 3 (cause 100 has 3 chracters.)
+
+// console.log(newBalance.toFixed(2)); // Output: 400.00
+
+const otherNumbers = 123.8966
+// console.log(otherNumbers.toPrecision(3)); // Output: 124
+const otherNum = 23.8966
+// console.log(otherNum.toPrecision(3)); // Output: 23.9
+// Note: It means we want precise value but on how many values we want to focus.
+
+const hundreds = 1000000
+// console.log(hundreds.toLocaleString('en-IN')); // Output: 10,00,000 (converted accor. to IN standards.)
+
+/* *******************************************MATHS******************************************************* 
+
+(ii) Maths, */
+console.log(Math); /* Output: Object [Math] {} 
+Note: When we run this console.log(Math) in browser's console we will get value under object. */
+
+console.log(Math.abs(-4)); // Output: 4 (Changes only minus values in plus)
+
+console.log(Math.round(4.6)); // Output: 5
+console.log(Math.round(4.4)); // Output: 4
+console.log(Math.ceil(4.2)); // Output: 5 (Choose top value)
+console.log(Math.floor(4.9)); // Output: 4 (Choose lowest value)
+
+console.log(Math.min(3, 2, 4, 6)); /* Output: 2 (Tells min value)
+Note: There is also "max". */
+
+console.log(Math.random()); // Output: 0.36675387800250636 (Gives random numbers between 0 & 1)
+console.log((Math.random()*10) + 1); // Now numbers will range from 1 to 9
+console.log(Math.floor(Math.random()*10) + 1); // Round offs at Random numbers at lowest value.
+
+const min = 10
+const max = 20
+console.log(Math.floor(Math.random() * (max - min + 1)) + min);
+// Note: (max - min) to get a range, (+ 1) to avoid zero, (+ min) to get minimum value to this.