[es6] implement spread calls

test/mjsunit/harmony/spread-call.js

+// Copyright 2014 the V8 project authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+// Flags: --harmony-spreadcalls
+
+(function testSpreadCallsStrict() {
+  "use strict"
+  function countArgs() { return arguments.length; }
+
+  // Test this argument
+  function returnThis() { return this; }
+  assertEquals(void 0, returnThis(..."test"));
+
+  // Test argument counting with different iterables
+  assertEquals(0, countArgs(...""));
+  assertEquals(1, countArgs(..."t"));
+  assertEquals(2, countArgs(..."te"));
+  assertEquals(3, countArgs(..."tes"));
+  assertEquals(4, countArgs(..."test"));
+  assertEquals(4, countArgs(..."tes", ..."t"));
+  assertEquals(4, countArgs("t", ..."es", "t"));
+  assertEquals(5, countArgs(..."test!"));
+  assertEquals(5, countArgs(..."tes", ..."t!"));
+  assertEquals(6, countArgs(..."test!!"));
+  assertEquals(6, countArgs(..."tes", ..."t!!"));
+
+  assertEquals(1, countArgs(...[1]));
+  assertEquals(2, countArgs(...[1, 2]));
+  assertEquals(3, countArgs(...[1, 2, 3]));
+  assertEquals(4, countArgs(...[1, 2, 3, 4]));
+  assertEquals(5, countArgs(...[1, 2, 3, 4, 5]));
+  assertEquals(6, countArgs(...[1, 2, 3, 4, 5, 6]));
+
+  assertEquals(1, countArgs(...new Set([1])));
+  assertEquals(2, countArgs(...new Set([1, 2])));
+  assertEquals(3, countArgs(...new Set([1, 2, 3])));
+  assertEquals(4, countArgs(...new Set([1, 2, 3, 4])));
+  assertEquals(5, countArgs(...new Set([1, 2, 3, 4, 5])));
+  assertEquals(6, countArgs(...new Set([1, 2, 3, 4, 5, 6])));
+
+  assertEquals(3, countArgs(...(function*(){ yield 1; yield 2; yield 3; })()));
+
+  // Test values
+  function sum() {
+    var sum = arguments[0];
+    for (var i = 1; i < arguments.length; ++i) {
+      sum += arguments[i];
+    }
+    return sum;
+  }
+
+  assertEquals(void 0, sum(...""));
+  assertEquals(void 0, sum(...[]));
+  assertEquals(void 0, sum(...new Set));
+  assertEquals(void 0, sum(...(function*() { })()));
+
+  assertEquals("test", sum(..."test"));
+  assertEquals(10, sum(...[1, 2, 3, 4]));
+  assertEquals(10, sum(...[1, 2, 3], 4));
+  assertEquals(10, sum(1, ...[2, 3], 4));
+  assertEquals(10, sum(1, ...[2, 3], ...[4]));
+  assertEquals(10, sum(1, 2, ...[3, 4]));
+  assertEquals(10, sum(...new Set([1, 2, 3, 4])));
+  assertEquals(10, sum(...(function*() {
+    yield 1;
+    yield 2;
+    yield 3;
+    yield 4;
+  })()));
+
+  // nested spreads
+  function makeArray() {
+    var result = [];
+    for (var i = 0; i < arguments.length; ++i) {
+      result.push(arguments[i]);
+    }
+    return result;
+  }
+  assertEquals(10, sum(...makeArray(...[1, 2, 3, 4])));
+  assertEquals("test!!!", sum(...makeArray(..."test!!!")));
+
+  // Methods
+  var O = {
+    returnThis: returnThis,
+    countArgs: countArgs,
+    sum: sum,
+    makeArray: makeArray,
+
+    nested: {
+      returnThis: returnThis,
+      countArgs: countArgs,
+      sum: sum,
+      makeArray: makeArray
+    }
+  };
+
+  // Test this argument
+  assertEquals(O, O.returnThis(..."test"));
+  assertEquals(O, O["returnThis"](..."test"));
+  assertEquals(O.nested, O.nested.returnThis(..."test"));
+  assertEquals(O.nested, O.nested["returnThis"](..."test"));
+
+  // Test argument counting with different iterables
+  assertEquals(0, O.countArgs(...""));
+  assertEquals(1, O.countArgs(..."t"));
+  assertEquals(2, O.countArgs(..."te"));
+  assertEquals(3, O.countArgs(..."tes"));
+  assertEquals(4, O.countArgs(..."test"));
+  assertEquals(4, O.countArgs(..."tes", ..."t"));
+  assertEquals(4, O.countArgs("t", ..."es", "t"));
+  assertEquals(5, O.countArgs(..."test!"));
+  assertEquals(5, O.countArgs(..."tes", ..."t!"));
+  assertEquals(6, O.countArgs(..."test!!"));
+  assertEquals(6, O.countArgs(..."tes", ..."t!!"));
+
+  assertEquals(1, O.countArgs(...[1]));
+  assertEquals(2, O.countArgs(...[1, 2]));
+  assertEquals(3, O.countArgs(...[1, 2, 3]));
+  assertEquals(4, O.countArgs(...[1, 2, 3, 4]));
+  assertEquals(5, O.countArgs(...[1, 2, 3, 4, 5]));
+  assertEquals(6, O.countArgs(...[1, 2, 3, 4, 5, 6]));
+
+  assertEquals(1, O.countArgs(...new Set([1])));
+  assertEquals(2, O.countArgs(...new Set([1, 2])));
+  assertEquals(3, O.countArgs(...new Set([1, 2, 3])));
+  assertEquals(4, O.countArgs(...new Set([1, 2, 3, 4])));
+  assertEquals(5, O.countArgs(...new Set([1, 2, 3, 4, 5])));
+  assertEquals(6, O.countArgs(...new Set([1, 2, 3, 4, 5, 6])));
+
+  assertEquals(3, O.countArgs(...(function*(){ yield 1; yield 2; yield 3; })()));
+
+  // Test values
+  assertEquals(void 0, O.sum(...""));
+  assertEquals(void 0, O.sum(...[]));
+  assertEquals(void 0, O.sum(...new Set));
+  assertEquals(void 0, O.sum(...(function*() { })()));
+
+  assertEquals("test", O.sum(..."test"));
+  assertEquals(10, O.sum(...[1, 2, 3, 4]));
+  assertEquals(10, O.sum(...[1, 2, 3], 4));
+  assertEquals(10, O.sum(1, ...[2, 3], 4));
+  assertEquals(10, O.sum(1, ...[2, 3], ...[4]));
+  assertEquals(10, O.sum(1, 2, ...[3, 4]));
+  assertEquals(10, O.sum(...new Set([1, 2, 3, 4])));
+  assertEquals(10, O.sum(...(function*() {
+    yield 1;
+    yield 2;
+    yield 3;
+    yield 4;
+  })()));
+
+  // nested spreads
+  assertEquals(10, O.sum(...O.makeArray(...[1, 2, 3, 4])));
+  assertEquals("test!!!", O.sum(...O.makeArray(..."test!!!")));
+})();
+
+
+(function testSpreadCallsSloppy() {
+  function countArgs() { return arguments.length; }
+
+  // Test argument counting with different iterables
+  assertEquals(0, countArgs(...""));
+  assertEquals(1, countArgs(..."t"));
+  assertEquals(2, countArgs(..."te"));
+  assertEquals(3, countArgs(..."tes"));
+  assertEquals(4, countArgs(..."test"));
+  assertEquals(4, countArgs(..."tes", ..."t"));
+  assertEquals(4, countArgs("t", ..."es", "t"));
+  assertEquals(5, countArgs(..."test!"));
+  assertEquals(5, countArgs(..."tes", ..."t!"));
+  assertEquals(6, countArgs(..."test!!"));
+  assertEquals(6, countArgs(..."tes", ..."t!!"));
+
+  assertEquals(1, countArgs(...[1]));
+  assertEquals(2, countArgs(...[1, 2]));
+  assertEquals(3, countArgs(...[1, 2, 3]));
+  assertEquals(4, countArgs(...[1, 2, 3, 4]));
+  assertEquals(5, countArgs(...[1, 2, 3, 4, 5]));
+  assertEquals(6, countArgs(...[1, 2, 3, 4, 5, 6]));
+
+  assertEquals(1, countArgs(...new Set([1])));
+  assertEquals(2, countArgs(...new Set([1, 2])));
+  assertEquals(3, countArgs(...new Set([1, 2, 3])));
+  assertEquals(4, countArgs(...new Set([1, 2, 3, 4])));
+  assertEquals(5, countArgs(...new Set([1, 2, 3, 4, 5])));
+  assertEquals(6, countArgs(...new Set([1, 2, 3, 4, 5, 6])));
+
+  assertEquals(3, countArgs(...(function*(){ yield 1; yield 2; yield 3; })()));
+
+  // Test values
+  function sum() {
+    var sum = arguments[0];
+    for (var i = 1; i < arguments.length; ++i) {
+      sum += arguments[i];
+    }
+    return sum;
+  }
+
+  assertEquals(void 0, sum(...""));
+  assertEquals(void 0, sum(...[]));
+  assertEquals(void 0, sum(...new Set));
+  assertEquals(void 0, sum(...(function*() { })()));
+
+  assertEquals("test", sum(..."test"));
+  assertEquals(10, sum(...[1, 2, 3, 4]));
+  assertEquals(10, sum(...[1, 2, 3], 4));
+  assertEquals(10, sum(1, ...[2, 3], 4));
+  assertEquals(10, sum(1, ...[2, 3], ...[4]));
+  assertEquals(10, sum(1, 2, ...[3, 4]));
+  assertEquals(10, sum(...new Set([1, 2, 3, 4])));
+  assertEquals(10, sum(...(function*() {
+    yield 1;
+    yield 2;
+    yield 3;
+    yield 4;
+  })()));
+
+  // nested spreads
+  function makeArray() {
+    var result = [];
+    for (var i = 0; i < arguments.length; ++i) {
+      result.push(arguments[i]);
+    }
+    return result;
+  }
+  assertEquals(10, sum(...makeArray(...[1, 2, 3, 4])));
+  assertEquals("test!!!", sum(...makeArray(..."test!!!")));
+})();

[arv (Not doing code reviews), 2015/02/18 15:07:06]

Maybe some tests with F.p.apply too?

function f(self) {
  'use strict';
  assertEquals(self, this);
}
f.call(undefined, ...[undefined]);
f.call(1, ...[1]);
var o = {};
f.call(o, ...[o]);

I would also add some tests that uses F.p.bind

[caitp (gmail), 2015/02/18 15:32:08]

Will do