From 8bc125abe03b688dfa48dd2622e9faa947c74c3e Mon Sep 17 00:00:00 2001
From: unknown <rahulrao7144@gmail.com>
Date: Sun, 3 Oct 2021 01:26:32 +0530
Subject: [PATCH] new js program

---
 Javascript/program-12/program.js | 58 ++++++++++++++++++++++++++++++++
 1 file changed, 58 insertions(+)
 create mode 100644 Javascript/program-12/program.js

diff --git a/Javascript/program-12/program.js b/Javascript/program-12/program.js
new file mode 100644
index 00000000..17c1131b
--- /dev/null
+++ b/Javascript/program-12/program.js
@@ -0,0 +1,58 @@
+// string concatenation
+let a = 2 + 2 + '1';
+console.log(a); // 41
+
+
+let b = '1' + 2 + 2;
+console.log(b); // 122
+
+// unary conversion using +
+let c = "";
+console.log(+c); // 0
+
+
+let val1 = "2";
+let val2 = "3";
+console.log(+val1 + +val2); // 5
+
+console.log(+false);
+
+
+// chaining assignment
+let x,y,z;
+x = y = z = 5;
+console.log(x,y,z); // 5 5 5
+
+// increment/decrement
+let counter = 5;
+console.log(++counter); // 6
+console.log(counter++); //6
+console.log(counter); //7
+console.log(--counter); // 6
+console.log(counter--); //6
+console.log(counter); //5
+
+
+//comma operators
+let comma = (1+2, 3+4);
+console.log(comma); // 7 (returns only the last result)
+
+let sym1 = Symbol("id");
+let sym2 = Symbol.for("id"); // if doesn't exist creats new one
+
+let str = "Hello \rworls";
+console.log(str)
+
+
+// Example to find common elements between 2 arrays.
+let ar1 = [1,2,3,4,5];
+let ar2 = [4,5,6];
+
+let ar = ar1.filter(function(val) {
+    for(let ke of this) {
+        if (val == ke)
+        return true;
+    }
+}, ar2);
+
+console.log( ar );
\ No newline at end of file