feat: Intro to Node.js & NPM (#39515)

extra/package.json

@@ -0,0 +1,14 @@
+{
+  "name": "extra",
+  "version": "1.0.0",
+  "description": "",
+  "main": "index.js",
+  "scripts": {
+    "test": "echo \"Error: no test specified\" && exit 1",
+    "pattern:diamond":" node patterns/diamond.js",
+    "pattern:equilateral":"node patterns/equilateral.js"
+
+  },
+  "author": "",
+  "license": "ISC"
+}

extra/patterns/diamond.js

@@ -0,0 +1,32 @@
+let n=process.argv[2]
+
+diamond(n)
+function diamond(n)
+{
+for(let i=0;i<n;i++)
+{
+    let str=""
+    for(let k=0;k<n-i-1;k++)
+    {
+        str=str+" "
+    }
+    for(let j=0;j<=i;j++)
+    {
+       str=str+"* "
+    }
+    console.log(str)
+}
+for(let i=n;i>0;i--)
+{     
+    let str=""
+    for(let k=0;k<n-i;k++)
+    {
+       str=str+" "
+    }
+    for(let j=0;j<i;j++)
+    {
+       str=str+"* "
+    }
+    console.log(str)
+}
+}

extra/patterns/equilateral.js

@@ -0,0 +1,24 @@
+n=process.argv[2]
+equilateral(n)
+function equilateral(n)
+{
+
+
+for(let i=0;i<n;i++)
+{
+    let str=""
+    for(let k=0;k<n-i-1;k++)
+    {
+        str=str+" "
+    }
+    for(let j=0;j<=i;j++)
+    {
+
+        str=str+"* "
+    }
+    console.log(str)
+
+}
+
+}
+