calculate rms

championswimmer · championswimmer · commit c01047a51b4a · 2019-09-21T18:09:15.000+05:30
Signed-off-by: Arnav Gupta &lt;arnav@codingblocks.com&gt;
diff --git a/Lecture08/array-ops/calcrms.js b/Lecture08/array-ops/calcrms.js
@@ -0,0 +1,25 @@
+let calc = document.getElementById('calc')
+let vals = document.getElementById('vals')
+let nRMS = document.getElementById('nRMS')
+let pRMS = document.getElementById('pRMS')
+let RMS = document.getElementById('RMS')
+
+calc.onclick = function() {
+  let numArr = vals.value.split(',').map((i) => +i.trim())
+  let meanSqr = (ac, val, i, a) => ac + (Math.pow(val, 2) / a.length)
+
+  RMS.innerText = Math.sqrt(
+    numArr
+    .reduce(meanSqr, 0)
+  )
+  pRMS.innerText = Math.sqrt(
+    numArr
+    .filter((i) => i > 0)
+    .reduce(meanSqr, 0)
+  )
+  nRMS.innerText = Math.sqrt(
+    numArr
+    .filter((i) => i < 0)
+    .reduce(meanSqr, 0)
+  )
+}
diff --git a/Lecture08/array-ops/index.html b/Lecture08/array-ops/index.html
@@ -5,7 +5,7 @@
   <meta name="viewport" content="width=device-width, initial-scale=1.0">
   <meta http-equiv="X-UA-Compatible" content="ie=edge">
   <title>Document</title>
-  <script src="array-ops.js"></script>
+  <script defer src="calcrms.js"></script>
 </head>
 <body>
 
