added toMap

Author: eva

src/keyed-array/keyed-array.spec.ts

@@ -72,4 +72,23 @@ describe('KeyedArray', () => {
       expect(keyedHelper.deleteByKey(someArray, 'Russia')).toEqual(someArray);
     });
   });
+
+  describe('toMap', () => {
+    it('works', () => {
+      expect(keyedHelper.toMap(someArray)).toEqual({
+        Italy: {
+          accountId: 'Italy',
+          score: 3,
+        },
+        UK: {
+          accountId: 'UK',
+          score: 1,
+        },
+        USA: {
+          accountId: 'USA',
+          score: 2,
+        },
+      });
+    });
+  });
 });

src/keyed-array/keyed-array.ts

@@ -36,6 +36,18 @@ export class KeyedArray<T> {
     return SimpleArray.find(array, x => getKey(x) === key);
   }
 
+  public toMap(array: T[]): Record<string, T> {
+    const { getKey } = this;
+    const myMap: { [k: string]: T } = {};
+    for (const a of array) {
+      const key = getKey(a);
+      if (myMap[key]) continue;
+      myMap[key] = a;
+    }
+
+    return myMap;
+  }
+
   public checkValid(array: T[], what?: string, where?: string): void {
     const { getKey } = this;
 

src/named-array/named-array.spec.ts

@@ -176,6 +176,25 @@ describe('NamedArray', () => {
     });
   });
 
+  describe('#toMap', () => {
+    it('works', () => {
+      expect(NamedArray.toMap(someArray)).toEqual({
+        Italy: {
+          name: 'Italy',
+          score: 3,
+        },
+        UK: {
+          name: 'UK',
+          score: 1,
+        },
+        USA: {
+          name: 'USA',
+          score: 2,
+        },
+      });
+    });
+  });
+
   describe('synchronize', () => {
     function valueEqual(a: any, b: any) {
       return a.value === b.value;

src/named-array/named-array.ts

@@ -117,6 +117,10 @@ export class NamedArray {
     return KEYED_ARRAY.get(array, name);
   }
 
+  static toMap<T extends NamedArray>(array: T[]): Record<string, T> {
+    return KEYED_ARRAY.toMap(array);
+  }
+
   static containsByName<T extends Nameable>(array: T[], name: string): boolean {
     return SimpleArray.contains(array, x => x.name === name);
   }