add solution for 118 in js

Author: limbowandering

solution/118.Pascal's Triangle/Solution.js

@@ -0,0 +1,14 @@
+const generate = function(numRows){
+  let arr = [];
+  for(let i = 0; i < numRows; i++){
+    let row = [];
+    row[0]=1;
+    row[i] = 1;
+
+    for(let j = 1; j < row.length - 1; j++){
+      row[j] = arr[i-1][j-1] + arr[i-1][j];
+    }
+    arr.push(row);
+  }
+  return arr;
+}