Create 1680-concatenation-of-consecutive-binary-numbers.js

Author: everthis

1680-concatenation-of-consecutive-binary-numbers.js

@@ -0,0 +1,16 @@
+/**
+ * @param {number} n
+ * @return {number}
+ */
+const concatenatedBinary = function(n) {
+  let res = ''
+  const mod = 10 ** 9 + 7
+  for(let i = 1; i <= n; i++) {
+    res += dec2bin(i)
+    res = dec2bin(parseInt(res, 2) % mod)
+  }
+  return parseInt(res, 2) % mod
+};
+function dec2bin(dec){
+  return (dec >>> 0).toString(2);
+}