solves problem 5.1

Author: amejiarosario

src/05-bits/00-bit-manipulation.js

@@ -36,12 +36,8 @@ function clearBit(n, i) {
  * @returns {number} new number with a given bit set/cleared
  */
 function updateBit(n, i, b) {
-  const mask = (1 << i);
-  if(b === 0) {
-    return n & ~mask;
-  } else {
-    return n | mask;
-  }
+  const mask = ~(1 << i);
+  return (n & mask) | (b << i);
 }
 
 module.exports = {

src/05-bits/01-insertion.js

@@ -17,7 +17,11 @@
 function insertion(n, m, i, j) {
   // TODO validate j > i and N > N
 
-  return n;
+  // mask to clear n between j and i
+  let mask = ~(1 << j);
+  mask = mask | ((1 << (i+1)) - 1);
+
+  return (n & mask) | (m << i);
 }
 
 module.exports = insertion;