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load(libdir + "asserts.js");
function testBasic() {
var g = function foo(a, b, c) { return a - b - c; };
for (var i = 0; i < 100; i++) {
var bound1 = g.bind(null, 1);
assertEq(bound1.length, 2);
assertEq(bound1.name, "bound foo");
var bound2 = bound1.bind(null, 2);
assertEq(bound2.length, 1);
assertEq(bound2.name, "bound bound foo");
assertEq(bound2(9), -10);
}
}
testBasic();
function testBindNonCtor() {
var g = (a, b, c) => a - b - c;
for (var i = 0; i < 100; i++) {
var bound1 = g.bind(null, 1);
var bound2 = bound1.bind(null, 2);
assertEq(bound1(2, 3), -4);
assertEq(bound2(4), -5);
assertThrowsInstanceOf(() => new bound1(2, 3), TypeError);
assertThrowsInstanceOf(() => new bound2(4), TypeError);
assertEq(bound2.length, 1);
assertEq(bound2.name, "bound bound g");
}
}
testBindNonCtor();
function testBindSelfHosted() {
var g = Array.prototype.map;
var arr = [1, 2, 3];
for (var i = 0; i < 100; i++) {
var bound1 = g.bind(arr);
var bound2 = bound1.bind(null, x => x + 5);
assertEq(bound1(x => x + 3).toString(), "4,5,6");
assertEq(bound2().toString(), "6,7,8");
assertEq(bound2.length, 0);
assertEq(bound2.name, "bound bound map");
}
}
testBindSelfHosted();
function testBoundDeletedName() {
var g = function foo(a, b, c) { return a - b - c; };
var bound1 = g.bind(null);
var bound2 = g.bind(null);
delete bound2.name;
for (var i = 0; i < 100; i++) {
var obj = i < 50 ? bound1 : bound2;
var bound3 = obj.bind(null);
assertEq(bound3.length, 3);
assertEq(bound3.name, i < 50 ? "bound bound foo" : "bound ");
}
}
testBoundDeletedName();
function testWeirdProto() {
var g = function foo() { return 123; };
var proto = {bind: Function.prototype.bind};
Object.setPrototypeOf(g, proto);
for (var i = 0; i < 100; i++) {
var bound1 = g.bind(null);
assertEq(Object.getPrototypeOf(bound1), proto);
var bound2 = bound1.bind(null);
assertEq(Object.getPrototypeOf(bound2), proto);
assertEq(bound2(), 123);
}
}
testWeirdProto();