Use destructuring assignments for named parameters (#180)

lib/runtime/dart/collection.js

 dart_library.library('dart/collection', null, /* Imports */[
   "dart/_runtime",
   'dart/core'
 ], /* Lazy imports */[
   'dart/_internal',
   'dart/_js_helper',
   'dart/math'
 ], function(exports, dart, core, _internal, _js_helper, math) {
   'use strict';
   let dartx = dart.dartx;
@@ skipping 31 matching lines @@
     return _Equality;
   });
   let _Equality = _Equality$();
   const _Hasher$ = dart.generic(function(K) {
     const _Hasher = dart.typedef('_Hasher', () => dart.functionType(core.int, [K]));
     return _Hasher;
   });
   let _Hasher = _Hasher$();
   const HashMap$ = dart.generic(function(K, V) {
     class HashMap extends core.Object {
-      static new(opts) {
-        let equals = opts && 'equals' in opts ? opts.equals : null;
-        let hashCode = opts && 'hashCode' in opts ? opts.hashCode : null;
-        let isValidKey = opts && 'isValidKey' in opts ? opts.isValidKey : null;
+      static new({equals = null, hashCode = null, isValidKey = null} = {}) {
         if (isValidKey == null) {
           if (hashCode == null) {
             if (equals == null) {
               return new (_HashMap$(K, V))();
             }
             hashCode = _defaultHashCode;
           } else {
             if (dart.notNull(core.identical(core.identityHashCode, hashCode)) && dart.notNull(core.identical(core.identical, equals))) {
               return new (_IdentityHashMap$(K, V))();
             }
@@ skipping 14 matching lines @@
       static identity() {
         return new (_IdentityHashMap$(K, V))();
       }
       static from(other) {
         let result = HashMap$(K, V).new();
         other.forEach(dart.fn((k, v) => {
           result.set(dart.as(k, K), dart.as(v, V));
         }));
         return result;
       }
-      static fromIterable(iterable, opts) {
-        let key = opts && 'key' in opts ? opts.key : null;
-        let value = opts && 'value' in opts ? opts.value : null;
+      static fromIterable(iterable, {key = null, value = null} = {}) {
         let map = HashMap$(K, V).new();
         Maps._fillMapWithMappedIterable(map, iterable, key, value);
         return map;
       }
       static fromIterables(keys, values) {
         let map = HashMap$(K, V).new();
         Maps._fillMapWithIterables(map, keys, values);
         return map;
       }
     }
@@ skipping 80 matching lines @@
         return result;
       }
       difference(other) {
         let result = this.toSet();
         for (let element of this) {
           if (dart.notNull(other.contains(element)))
             result.remove(element);
         }
         return result;
       }
-      toList(opts) {
-        let growable = opts && 'growable' in opts ? opts.growable : true;
+      toList({growable = true} = {}) {
         let result = dart.notNull(growable) ? (() => {
           let _ = core.List$(E).new();
           _[dartx.length] = this.length;
           return _;
         }).bind(this)() : core.List$(E).new(this.length);
         let i = 0;
         for (let element of this)
           result[dartx.set]((() => {
             let x = i;
             i = dart.notNull(x) + 1;
@@ skipping 110 matching lines @@
         let it = this.iterator;
         if (!dart.notNull(it.moveNext())) {
           dart.throw(_internal.IterableElementError.noElement());
         }
         let result = null;
         do {
           result = it.current;
         } while (dart.notNull(it.moveNext()));
         return result;
       }
-      firstWhere(test, opts) {
+      firstWhere(test, {orElse = null} = {}) {
         dart.as(test, dart.functionType(core.bool, [E]));
-        let orElse = opts && 'orElse' in opts ? opts.orElse : null;
         dart.as(orElse, dart.functionType(E, []));
         for (let element of this) {
           if (dart.notNull(test(element)))
             return element;
         }
         if (orElse != null)
           return orElse();
         dart.throw(_internal.IterableElementError.noElement());
       }
-      lastWhere(test, opts) {
+      lastWhere(test, {orElse = null} = {}) {
         dart.as(test, dart.functionType(core.bool, [E]));
-        let orElse = opts && 'orElse' in opts ? opts.orElse : null;
         dart.as(orElse, dart.functionType(E, []));
         let result = null;
         let foundMatching = false;
         for (let element of this) {
           if (dart.notNull(test(element))) {
             result = element;
             foundMatching = true;
           }
         }
         if (dart.notNull(foundMatching))
@@ skipping 139 matching lines @@
         intersection: [core.Set$(E), [core.Set$(core.Object)]],
         toSet: [core.Set$(E), []]
       })
     });
     dart.defineExtensionMembers(_HashSetBase, ['toSet']);
     return _HashSetBase;
   });
   let _HashSetBase = _HashSetBase$();
   const HashSet$ = dart.generic(function(E) {
     class HashSet extends core.Object {
-      static new(opts) {
-        let equals = opts && 'equals' in opts ? opts.equals : null;
-        let hashCode = opts && 'hashCode' in opts ? opts.hashCode : null;
-        let isValidKey = opts && 'isValidKey' in opts ? opts.isValidKey : null;
+      static new({equals = null, hashCode = null, isValidKey = null} = {}) {
         if (isValidKey == null) {
           if (hashCode == null) {
             if (equals == null) {
               return new (_HashSet$(E))();
             }
             hashCode = _defaultHashCode;
           } else {
             if (dart.notNull(core.identical(core.identityHashCode, hashCode)) && dart.notNull(core.identical(core.identical, equals))) {
               return new (_IdentityHashSet$(E))();
             }
@@ skipping 109 matching lines @@
         return dart.toString(buffer);
       }
       any(f) {
         dart.as(f, dart.functionType(core.bool, [E]));
         for (let element of this) {
           if (dart.notNull(f(element)))
             return true;
         }
         return false;
       }
-      toList(opts) {
-        let growable = opts && 'growable' in opts ? opts.growable : true;
+      toList({growable = true} = {}) {
         return core.List$(E).from(this, {growable: growable});
       }
       toSet() {
         return core.Set$(E).from(this);
       }
       get length() {
         dart.assert(!dart.is(this, _internal.EfficientLength));
         let count = 0;
         let it = this[dartx.iterator];
         while (dart.notNull(it.moveNext())) {
@@ skipping 41 matching lines @@
       }
       get single() {
         let it = this[dartx.iterator];
         if (!dart.notNull(it.moveNext()))
           dart.throw(_internal.IterableElementError.noElement());
         let result = it.current;
         if (dart.notNull(it.moveNext()))
           dart.throw(_internal.IterableElementError.tooMany());
         return result;
       }
-      firstWhere(test, opts) {
+      firstWhere(test, {orElse = null} = {}) {
         dart.as(test, dart.functionType(core.bool, [E]));
-        let orElse = opts && 'orElse' in opts ? opts.orElse : null;
         dart.as(orElse, dart.functionType(E, []));
         for (let element of this) {
           if (dart.notNull(test(element)))
             return element;
         }
         if (orElse != null)
           return orElse();
         dart.throw(_internal.IterableElementError.noElement());
       }
-      lastWhere(test, opts) {
+      lastWhere(test, {orElse = null} = {}) {
         dart.as(test, dart.functionType(core.bool, [E]));
-        let orElse = opts && 'orElse' in opts ? opts.orElse : null;
         dart.as(orElse, dart.functionType(E, []));
         let result = null;
         let foundMatching = false;
         for (let element of this) {
           if (dart.notNull(test(element))) {
             result = element;
             foundMatching = true;
           }
         }
         if (dart.notNull(foundMatching))
@@ skipping 170 matching lines @@
         return dart.toString(buffer);
       }
       any(f) {
         dart.as(f, dart.functionType(core.bool, [E]));
         for (let element of this) {
           if (dart.notNull(f(element)))
             return true;
         }
         return false;
       }
-      toList(opts) {
-        let growable = opts && 'growable' in opts ? opts.growable : true;
+      toList({growable = true} = {}) {
         return core.List$(E).from(this, {growable: growable});
       }
       toSet() {
         return core.Set$(E).from(this);
       }
       get length() {
         dart.assert(!dart.is(this, _internal.EfficientLength));
         let count = 0;
         let it = this[dartx.iterator];
         while (dart.notNull(it.moveNext())) {
@@ skipping 41 matching lines @@
       }
       get single() {
         let it = this[dartx.iterator];
         if (!dart.notNull(it.moveNext()))
           dart.throw(_internal.IterableElementError.noElement());
         let result = it.current;
         if (dart.notNull(it.moveNext()))
           dart.throw(_internal.IterableElementError.tooMany());
         return result;
       }
-      firstWhere(test, opts) {
+      firstWhere(test, {orElse = null} = {}) {
         dart.as(test, dart.functionType(core.bool, [E]));
-        let orElse = opts && 'orElse' in opts ? opts.orElse : null;
         dart.as(orElse, dart.functionType(E, []));
         for (let element of this) {
           if (dart.notNull(test(element)))
             return element;
         }
         if (orElse != null)
           return orElse();
         dart.throw(_internal.IterableElementError.noElement());
       }
-      lastWhere(test, opts) {
+      lastWhere(test, {orElse = null} = {}) {
         dart.as(test, dart.functionType(core.bool, [E]));
-        let orElse = opts && 'orElse' in opts ? opts.orElse : null;
         dart.as(orElse, dart.functionType(E, []));
         let result = null;
         let foundMatching = false;
         for (let element of this) {
           if (dart.notNull(test(element))) {
             result = element;
             foundMatching = true;
           }
         }
         if (dart.notNull(foundMatching))
@@ skipping 275 matching lines @@
       })
     });
     return HasNextIterator;
   });
   let HasNextIterator = HasNextIterator$();
   HasNextIterator._HAS_NEXT_AND_NEXT_IN_CURRENT = 0;
   HasNextIterator._NO_NEXT = 1;
   HasNextIterator._NOT_MOVED_YET = 2;
   const LinkedHashMap$ = dart.generic(function(K, V) {
     class LinkedHashMap extends core.Object {
-      static new(opts) {
-        let equals = opts && 'equals' in opts ? opts.equals : null;
-        let hashCode = opts && 'hashCode' in opts ? opts.hashCode : null;
-        let isValidKey = opts && 'isValidKey' in opts ? opts.isValidKey : null;
+      static new({equals = null, hashCode = null, isValidKey = null} = {}) {
         if (isValidKey == null) {
           if (hashCode == null) {
             if (equals == null) {
               return new (_LinkedHashMap$(K, V))();
             }
             hashCode = _defaultHashCode;
           } else {
             if (dart.notNull(core.identical(core.identityHashCode, hashCode)) && dart.notNull(core.identical(core.identical, equals))) {
               return new (_LinkedIdentityHashMap$(K, V))();
             }
@@ skipping 14 matching lines @@
       static identity() {
         return new (_LinkedIdentityHashMap$(K, V))();
       }
       static from(other) {
         let result = LinkedHashMap$(K, V).new();
         other.forEach(dart.fn((k, v) => {
           result.set(dart.as(k, K), dart.as(v, V));
         }));
         return result;
       }
-      static fromIterable(iterable, opts) {
-        let key = opts && 'key' in opts ? opts.key : null;
-        let value = opts && 'value' in opts ? opts.value : null;
+      static fromIterable(iterable, {key = null, value = null} = {}) {
         let map = LinkedHashMap$(K, V).new();
         Maps._fillMapWithMappedIterable(map, iterable, key, value);
         return map;
       }
       static fromIterables(keys, values) {
         let map = LinkedHashMap$(K, V).new();
         Maps._fillMapWithIterables(map, keys, values);
         return map;
       }
       static _literal(keyValuePairs) {
@@ skipping 13 matching lines @@
         fromIterables: [LinkedHashMap$(K, V), [core.Iterable$(K), core.Iterable$(V)]],
         _literal: [LinkedHashMap$(K, V), [core.List]],
         _empty: [LinkedHashMap$(K, V), []]
       })
     });
     return LinkedHashMap;
   });
   let LinkedHashMap = LinkedHashMap$();
   const LinkedHashSet$ = dart.generic(function(E) {
     class LinkedHashSet extends core.Object {
-      static new(opts) {
-        let equals = opts && 'equals' in opts ? opts.equals : null;
-        let hashCode = opts && 'hashCode' in opts ? opts.hashCode : null;
-        let isValidKey = opts && 'isValidKey' in opts ? opts.isValidKey : null;
+      static new({equals = null, hashCode = null, isValidKey = null} = {}) {
         if (isValidKey == null) {
           if (hashCode == null) {
             if (equals == null) {
               return new (_LinkedHashSet$(E))();
             }
             hashCode = _defaultHashCode;
           } else {
             if (dart.notNull(core.identical(core.identityHashCode, hashCode)) && dart.notNull(core.identical(core.identical, equals))) {
               return new (_LinkedIdentityHashSet$(E))();
             }
@@ skipping 330 matching lines @@
         let length = this.length;
         for (let i = 0; dart.notNull(i) < dart.notNull(length); i = dart.notNull(i) + 1) {
           if (dart.notNull(test(this.get(i))))
             return true;
           if (length != this.length) {
             dart.throw(new core.ConcurrentModificationError(this));
           }
         }
         return false;
       }
-      firstWhere(test, opts) {
+      firstWhere(test, {orElse = null} = {}) {
         dart.as(test, dart.functionType(core.bool, [E]));
-        let orElse = opts && 'orElse' in opts ? opts.orElse : null;
         dart.as(orElse, dart.functionType(E, []));
         let length = this.length;
         for (let i = 0; dart.notNull(i) < dart.notNull(length); i = dart.notNull(i) + 1) {
           let element = this.get(i);
           if (dart.notNull(test(element)))
             return element;
           if (length != this.length) {
             dart.throw(new core.ConcurrentModificationError(this));
           }
         }
         if (orElse != null)
           return orElse();
         dart.throw(_internal.IterableElementError.noElement());
       }
-      lastWhere(test, opts) {
+      lastWhere(test, {orElse = null} = {}) {
         dart.as(test, dart.functionType(core.bool, [E]));
-        let orElse = opts && 'orElse' in opts ? opts.orElse : null;
         dart.as(orElse, dart.functionType(E, []));
         let length = this.length;
         for (let i = dart.notNull(length) - 1; dart.notNull(i) >= 0; i = dart.notNull(i) - 1) {
           let element = this.get(i);
           if (dart.notNull(test(element)))
             return element;
           if (length != this.length) {
             dart.throw(new core.ConcurrentModificationError(this));
           }
         }
@@ skipping 77 matching lines @@
         dart.as(test, dart.functionType(core.bool, [E]));
         return new (_internal.SkipWhileIterable$(E))(this, test);
       }
       take(count) {
         return new (_internal.SubListIterable$(E))(this, 0, count);
       }
       takeWhile(test) {
         dart.as(test, dart.functionType(core.bool, [E]));
         return new (_internal.TakeWhileIterable$(E))(this, test);
       }
-      toList(opts) {
-        let growable = opts && 'growable' in opts ? opts.growable : true;
+      toList({growable = true} = {}) {
         let result = null;
         if (dart.notNull(growable)) {
           result = core.List$(E).new();
           result[dartx.length] = this[dartx.length];
         } else {
           result = core.List$(E).new(this[dartx.length]);
         }
         for (let i = 0; dart.notNull(i) < dart.notNull(this[dartx.length]); i = dart.notNull(i) + 1) {
           result[dartx.set](i, this.get(i));
         }
@@ skipping 1163 matching lines @@
         if (this[_head] == this[_tail])
           dart.throw(_internal.IterableElementError.noElement());
         if (dart.notNull(this.length) > 1)
           dart.throw(_internal.IterableElementError.tooMany());
         return this[_table][dartx.get](this[_head]);
       }
       elementAt(index) {
         core.RangeError.checkValidIndex(index, this);
         return this[_table][dartx.get](dart.notNull(this[_head]) + dart.notNull(index) & dart.notNull(this[_table][dartx.length]) - 1);
       }
-      toList(opts) {
-        let growable = opts && 'growable' in opts ? opts.growable : true;
+      toList({growable = true} = {}) {
         let list = null;
         if (dart.notNull(growable)) {
           list = core.List$(E).new();
           list[dartx.length] = this.length;
         } else {
           list = core.List$(E).new(this.length);
         }
         this[_writeToList](list);
         return list;
       }
@@ skipping 490 matching lines @@
         if (compare === void 0)
           compare = null;
         if (isValidKey === void 0)
           isValidKey = null;
         let result = new (SplayTreeMap$(K, V))();
         other.forEach(dart.fn((k, v) => {
           result.set(dart.as(k, K), dart.as(v, V));
         }));
         return result;
       }
-      static fromIterable(iterable, opts) {
-        let key = opts && 'key' in opts ? opts.key : null;
-        let value = opts && 'value' in opts ? opts.value : null;
-        let compare = opts && 'compare' in opts ? opts.compare : null;
-        let isValidKey = opts && 'isValidKey' in opts ? opts.isValidKey : null;
+      static fromIterable(iterable, {key = null, value = null, compare = null, isValidKey = null} = {}) {
         let map = new (SplayTreeMap$(K, V))(compare, isValidKey);
         Maps._fillMapWithMappedIterable(map, iterable, key, value);
         return map;
       }
       static fromIterables(keys, values, compare, isValidKey) {
         if (compare === void 0)
           compare = null;
         if (isValidKey === void 0)
           isValidKey = null;
         let map = new (SplayTreeMap$(K, V))(compare, isValidKey);
@@ skipping 2493 matching lines @@
   exports.LinkedHashMapKeyIterable$ = LinkedHashMapKeyIterable$;
   exports.LinkedHashMapKeyIterable = LinkedHashMapKeyIterable;
   exports.LinkedHashMapKeyIterator$ = LinkedHashMapKeyIterator$;
   exports.LinkedHashMapKeyIterator = LinkedHashMapKeyIterator;
   exports.HashSetIterator$ = HashSetIterator$;
   exports.HashSetIterator = HashSetIterator;
   exports.LinkedHashSetCell = LinkedHashSetCell;
   exports.LinkedHashSetIterator$ = LinkedHashSetIterator$;
   exports.LinkedHashSetIterator = LinkedHashSetIterator;
 });