refactor: move all utility functions into the utils dir

modules/@angular/router/src/utils/collection.ts

@@ -0,0 +1,55 @@
+export function shallowEqual(a: {[x:string]:any}, b: {[x:string]:any}): boolean {
+  var k1 = Object.keys(a);
+  var k2 = Object.keys(b);
+  if (k1.length != k2.length) {
+    return false;
+  }
+  var key;
+  for (var i = 0; i < k1.length; i++) {
+    key = k1[i];
+    if (a[key] !== b[key]) {
+      return false;
+    }
+  }
+  return true;
+}
+
+export function flatten<T>(a: T[][]): T[] {
+  const target = [];
+  for (let i = 0; i < a.length; ++i) {
+    for (let j = 0; j < a[i].length; ++j) {
+      target.push(a[i][j]);
+    }
+  }
+  return target;
+}
+
+export function first<T>(a: T[]): T | null {
+  return a.length > 0 ? a[0] : null;
+}
+
+export function merge<V>(m1: {[key: string]: V}, m2: {[key: string]: V}): {[key: string]: V} {
+  var m: {[key: string]: V} = {};
+
+  for (var attr in m1) {
+    if (m1.hasOwnProperty(attr)) {
+      m[attr] = m1[attr];
+    }
+  }
+
+  for (var attr in m2) {
+    if (m2.hasOwnProperty(attr)) {
+      m[attr] = m2[attr];
+    }
+  }
+
+  return m;
+}
+
+export function forEach<K, V>(map: {[key: string]: V}, callback: /*(V, K) => void*/ Function): void {
+  for (var prop in map) {
+    if (map.hasOwnProperty(prop)) {
+      callback(map[prop], prop);
+    }
+  }
+}