Add support for .[0] syntax

Author: antonmedv

package.json

@@ -46,15 +46,15 @@
     "node": ">=8"
   },
   "dependencies": {
-    "@medv/blessed": "^2.0.0",
+    "@medv/blessed": "^2.0.1",
     "chalk": "^3.0.0",
     "indent-string": "^4.0.0",
     "lossless-json": "^1.0.3",
     "string-width": "^4.2.0"
   },
   "devDependencies": {
     "ava": "^2.4.0",
-    "pkg": "^4.4.1",
+    "pkg": "^4.4.2",
     "release-it": "^12.4.3"
   }
 }

reduce.js

@@ -1,22 +1,30 @@
 'use strict'
 
 function reduce(json, code) {
-  if (/^\./.test(code)) {
-    const fx = eval(`function fn() { 
-      return ${code === '.' ? 'this' : 'this' + code} 
-    }; fn`)
-    return fx.call(json)
+  if ('.' === code) {
+    return json
   }
 
   if ('?' === code) {
     return Object.keys(json)
   }
 
-  const fx = eval(`function fn() { 
+  if (/^\.\[/.test(code)) {
+    return eval(`function fn() { 
+      return this${code.substring(1)} 
+    }; fn`).call(json)
+  }
+
+  if (/^\./.test(code)) {
+    return eval(`function fn() { 
+      return this${code} 
+    }; fn`).call(json)
+  }
+
+  const fn = eval(`function fn() { 
     return ${code} 
-  }; fn`)
+  }; fn`).call(json)
 
-  const fn = fx.call(json)
   if (typeof fn === 'function') {
     return fn(json)
   }