feat: added parse method & test cases

fahimfaisaal · fahimfaisaal · commit b7c961cc82e1 · 2022-03-26T21:41:43.000+06:00
diff --git a/Cache/LRUCache.js b/Cache/LRUCache.js
@@ -87,6 +87,19 @@ class LRUCache {
     return null
   }
 
+  parse (json) {
+    const { misses, hits, cache } = JSON.parse(json)
+
+    this.misses += misses ?? 0
+    this.hits += hits ?? 0
+
+    for (const key in cache) {
+      this.set(key, cache[key])
+    }
+
+    return this
+  }
+
   toString (indent) {
     const replacer = (_, value) => {
       if (value instanceof Set) {
diff --git a/Cache/test/LRUCache.test.js b/Cache/test/LRUCache.test.js
@@ -41,11 +41,17 @@ describe('Testing LRUCache', () => {
       size: 2
     })
 
+    const json = '{"misses":3,"hits":6,"cache":{"3":3,"4":4}}'
+    expect(cache.toString()).toBe(json)
+
+    // merge with json
+    cache.parse(json)
+
     cache.capacity-- // now the capacity decreasing by one
 
     expect(cache.info).toEqual({
-      misses: 3,
-      hits: 6,
+      misses: 6,
+      hits: 12,
       capacity: 1,
       size: 1
     })
