This PR is the solution to the 'js basics' #<1>

1-js-basics/solution.md

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+# js-basics
+
+---
+## Sub Topic-1
+
+### challenge 
+```
+Javascript is case-sensitive,which means both age and AGE are different identifiers and values are also different
+
+
+
+
+- const obj = { a: 3 };
+obj = { b: 5 } // not allowed
+
+- Case sentivity
+
+- == performs type coercion before comaprsion
+
+2=='2'  //true
+
+- === checks both value and type ,without coercion.
+
+2==='2'  //false
+
+
+
+NaN which is not equal to itself
+```
+### Assignment
+
+```
+I will use these datatypes to create a shopping cart
+    -Number
+    -String
+    -Boolean
+    -Array
+    -Null
+
+
+Number :
+    I have choosed this as we will be pricing the amount for items ,which can be used for price calculation
+
+String:
+    This is used for naming and description of the item
+
+Boolean :
+    To check payment status.Whether the payment is done or not
+
+ Array:
+    To show the produts or to add the produts in cart
+    as it stores multiple items
+
+Null :
+    Used when an item is removed from cart or store or when item is not there
+```
+---
+
+## Sub Topic-2 
+
+### Challenge
+```
+Function can be called be directly but method should be called with an object
+```
+
+### Assignment
+
+```
+function printGreetings(name){
+	let grettings=` hi,${name}`;
+	console.log(grettings);
+}
+
+function add(num1,num2){
+	return num1+num2;}
+
+function grettings(){
+	console.log(“good morning”);
+}
+
+function mail(local_part,domainName=”gmail.com”){
+	email=`${local_part}@${domainName}`;
+	console.log(email);
+}
+
+mail(“dilip”)
+mail(“dilip”,”yahoo.com”)
+
+```
+
+
+## Sub Topic-3
+
+### Challenge 
+
+```
+et age=20;
+if(age>=18){
+	console.log(“elegible for driving licenses”);
+}
+else{
+	console.log(“not eligible for drivinglicenses”);
+}
+
+
+
+let age=17;
+let age_check=age>=18 ? “eligible for driving licenses” : “not eligible for drivinglicenses”;
+console.log(age_check);
+
+
+I prefer ternary operation over logical operations if it is simple like deciding in between two .But it would be complex to understand when the expression is complex 
+
+Selecting between ternary and logical operation depends on the situtaion and complexiy
+
+```
+
+
+### Assignment
+
+```
+let allStudents = ['A', 'B-', 1, 4, 5, 2];
+let studentsWhoPass = [];
+
+for (let i = 0; i < allStudents.length; i++) {
+    let grade = allStudents[i];
+	//number 
+    if (typeof grade === "number") {
+        if (grade >= 3) {
+            studentsWhoPass.push(grade);
+        }
+	//letters
+    } else if (typeof grade === "string") {
+        if (grade === "A" || grade === "A-" || grade === "B" || grade === "B-" || grade === "C") {
+            studentsWhoPass.push(grade);
+        }
+    }
+}
+
+console.log("Students who pass:", studentsWhoPass);
+
+```
+
+
+## Sub Topic-4
+
+### Challenge
+
+```
+let fruits=[“apple”,”kiwi”,”banana”];
+for(let fruit of fruits){
+	console.log(fruit);}
+
+let fruits = ["apple", "kiwi", "banana"];
+
+fruits.forEach(fruit => {
+    console.log(fruit);
+});
+```
+
+### Assignment
+
+```
+let list_thirdnumber=[];
+for(let i=1;i<=20;i=i+3){
+	list_thirdnumber.push(i);
+	}
+console.log(list_thirdnumber);
+
+```