js-on-sx: baseline commit (278/280 unit, 148/148 slice, runner stub)

Initial commit of the lib/js/ tree and plans/ directory. A previous
session left template-string work in progress — 278/280 unit tests pass
(2 failing: tpl part-count off-by-one, escaped-backtick ident lookup).
test262-runner.py and scoreboard are placeholders (0/8 with 7 timeouts);
fixing the runner is the next queue item.

lib/js/test262-slice/objects/array_filter_reduce.expected

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+12

lib/js/test262-slice/objects/array_filter_reduce.js

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+[1, 2, 3, 4, 5].filter(x => x > 2).reduce((a, b) => a + b, 0)

lib/js/test262-slice/objects/array_map.expected

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+2,4,6

lib/js/test262-slice/objects/array_map.js

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+[1, 2, 3].map(x => x * 2).join(",")

lib/js/test262-slice/objects/array_method_chain.expected

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+170

lib/js/test262-slice/objects/array_method_chain.js

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+[5, 2, 8, 1, 4].filter(x => x > 2).map(x => x * 10).reduce((a, b) => a + b, 0)

lib/js/test262-slice/objects/array_mutate.expected

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+99

lib/js/test262-slice/objects/array_mutate.js

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+var a = [1, 2, 3];
+a[0] = 99;
+a[0]

lib/js/test262-slice/objects/array_push_length.expected

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+3

lib/js/test262-slice/objects/array_push_length.js

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+var a = [];
+a.push(1);
+a.push(2);
+a.push(3);
+a.length

lib/js/test262-slice/objects/arrow_lexical_this.expected

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+5

lib/js/test262-slice/objects/arrow_lexical_this.js

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+var o = { x: 5, get: function() { var f = () => this.x; return f(); } };
+o.get()

lib/js/test262-slice/objects/class_basic.expected

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+7

lib/js/test262-slice/objects/class_basic.js

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+class Point {
+  constructor(x, y) { this.x = x; this.y = y; }
+  sum() { return this.x + this.y; }
+}
+var p = new Point(3, 4);
+p.sum()

lib/js/test262-slice/objects/class_extend_chain.expected

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+abc

lib/js/test262-slice/objects/class_extend_chain.js

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+class A { a() { return "a"; } }
+class B extends A { b() { return "b"; } }
+class C extends B { c() { return this.a() + this.b() + "c"; } }
+var c = new C();
+c.c()

lib/js/test262-slice/objects/class_inherit.expected

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+woof

lib/js/test262-slice/objects/class_inherit.js

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+class Animal { speak() { return "generic"; } }
+class Dog extends Animal { speak() { return "woof"; } }
+class Puppy extends Dog {}
+var p = new Puppy();
+p.speak()

lib/js/test262-slice/objects/counter_closure.expected

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+3

lib/js/test262-slice/objects/counter_closure.js

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+function makeCounter() {
+  var n = 0;
+  return {
+    inc: function() { n = n + 1; return n; },
+    val: function() { return n; }
+  };
+}
+var c = makeCounter();
+c.inc(); c.inc(); c.inc();
+c.val()

lib/js/test262-slice/objects/in_operator.expected

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+true

lib/js/test262-slice/objects/in_operator.js

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+var o = { x: 1, y: 2 };
+('x' in o) && !('z' in o)

lib/js/test262-slice/objects/instanceof.expected

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+true

lib/js/test262-slice/objects/instanceof.js

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+class A {}
+class B extends A {}
+var b = new B();
+(b instanceof B) && (b instanceof A)

lib/js/test262-slice/objects/method_this.expected

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+5

lib/js/test262-slice/objects/method_this.js

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+var o = { x: 5, getX: function() { return this.x; } };
+o.getX()

lib/js/test262-slice/objects/new_constructor.expected

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+7

lib/js/test262-slice/objects/new_constructor.js

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+function Point(x, y) { this.x = x; this.y = y; }
+var p = new Point(3, 4);
+p.x + p.y

lib/js/test262-slice/objects/object_mutate.expected

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+3

lib/js/test262-slice/objects/object_mutate.js

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+var o = { x: 1 };
+o.y = 2;
+o.x + o.y

lib/js/test262-slice/objects/prototype_chain.expected

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+7

lib/js/test262-slice/objects/prototype_chain.js

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+function Point(x, y) { this.x = x; this.y = y; }
+Point.prototype.sum = function() { return this.x + this.y; };
+var p = new Point(3, 4);
+p.sum()

lib/js/test262-slice/objects/string_method.expected

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+HELLO-WORLD

lib/js/test262-slice/objects/string_method.js

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+"Hello World".toUpperCase().split(" ").join("-")

lib/js/test262-slice/objects/string_slice.expected

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+cde

lib/js/test262-slice/objects/string_slice.js

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+"abcdefg".slice(2, 5)