chg: pkg: make a massive refactor to the backend and remove all unnecessary deps - and make small refactors for the frontend too #4

assets/js/mine-seeker/grid/grid.js

@@ -24,11 +24,7 @@ class Grid extends React.Component {
 
   createSet(obj) {
     for (let i = 0, j = this.state.row * this.state.col; i < j; i++) {
-      obj.push(
-        0 < this.state.mines
-          ? 'm'
-          : 'w',
-      );
+      obj.push(0 < this.state.mines ? 'm' : 'w');
       this.state.mines--;
     }
 
@@ -61,15 +57,8 @@ class Grid extends React.Component {
     return grid;
   }
 
-  checkMine(field, i, j) {
-    return 'undefined' !== typeof field[i] && 'undefined' !== typeof field[i][j] && 'm' === field[i][j];
-  }
-
   isThereMine(obj, row, col) {
-    if (this.checkMine(obj, row, col)) {
-      return 1;
-    }
-    return 0;
+    return 'm' === obj?.[row]?.[col] ? 1 : 0;
   }
 
   numberingGrid(obj) {