Day 22: Data types

javascript/Day22/index.js

@@ -0,0 +1,120 @@
+typeof 3;
+("number");
+typeof "abc";
+("string");
+typeof true;
+("boolean");
+typeof {};
+("object");
+typeof null;
+("object");
+typeof [];
+("object");
+typeof undefined;
+("undefined");
+
+var x = 10;
+
+x = 23;
+
+var obj = {
+  name: "utkarsh",
+};
+
+var infinite = Infinity;
+
+var not_a_number = NaN;
+
+typeof NaN;
+// ("number");
+NaN == NaN;
+// false;
+NaN === NaN;
+// false;
+null === null;
+// true;
+null == null;
+// true;
+undefined === undefined;
+//true
+
+isNaN(NaN);
+true;
+isNaN(2);
+false;
+isNaN("3");
+
+isFinite(Infinity);
+false;
+isFinite(2);
+true;
+
+var name = "Utkarsh Gupta";
+
+var x = 10;
+var y = 20;
+
+var sum = x + y;
+
+console.log(name, sum);
+
+console.log(0 / 0);
+// NaN
+
+console.log("b" + 4);
+
+console.log("utkarsh" + " " + "Gupta");
+
+var number = 10;
+
+var float = 99.38;
+
+console.log(float.toString());
+
+var three = parseInt("3");
+
+console.log(typeof three);
+
+console.log(parseInt("a"));
+//NaN
+
+console.log(parseFloat("3.4"));
+
+var x = 123.5;
+
+console.log(x.toFixed());
+var x = 123.5732;
+
+console.log(x.toFixed(3));
+
+var firstName = 'I love "JavaScript"';
+
+console.log(firstName);
+
+var text = "I love JavaScript";
+
+console.log(text.toUpperCase());
+console.log(text.toLowerCase());
+
+var text = "I love";
+
+var js = "Javascript";
+
+console.log(text + " " + js);
+
+var result = text.concat(" ", js);
+
+console.log(result);
+
+text.trim();
+console.log(text.charAt(5));
+
+console.log(text.split("_"));
+
+console.log(text.split(" "));
+
+console.log(text.length);
+console.log(text.indexOf("h")); //-1
+console.log(text.indexOf("v", 5)); // starting position
+console.log(text.lastIndexOf("v"));
+console.log(text.slice(2, -2));