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const assert = require('assert');
exports.test_has_instance = function(sym) {
class Array1 {
static [sym](instance) {
return Array.isArray(instance);
}
}
assert.equal(typeof sym, "symbol");
assert.ok([] instanceof Array1);
};
exports.test_is_concat_spreadable = function(sym) {
const alpha = ['a', 'b', 'c'];
const numeric = [1, 2, 3];
let alphaNumeric = alpha.concat(numeric);
assert.deepEqual(alphaNumeric, ["a", "b", "c", 1, 2, 3]);
numeric[sym] = false;
alphaNumeric = alpha.concat(numeric);
assert.deepEqual(alphaNumeric, ["a", "b", "c", numeric]);
};
exports.test_iterator = function(sym) {
const iterable1 = new Object();
iterable1[sym] = function* () {
yield 1;
yield 2;
yield 3;
};
assert.deepEqual([...iterable1], [1, 2, 3]);
};
exports.test_async_iterator = async function(sym) {
const iterable1 = new Object();
iterable1[sym] = function () {
let done = false;
return {
next() {
if (done) {
return Promise.resolve({
done: true,
value: 1
});
} else {
done = true;
return Promise.resolve({
done: false,
value: 0
});
}
}
};
};
const values = [];
for await (let value of iterable1) {
values.push(value);
}
assert.deepEqual(values, [0]);
};
exports.test_match = function(sym) {
const regexp1 = /foo/;
assert.throws(() => '/foo/'.startsWith(regexp1));
regexp1[sym] = false;
assert.ok('/foo/'.startsWith(regexp1));
assert.equal('/baz/'.endsWith(regexp1), false);
};
exports.test_replace = function(sym) {
class Replace1 {
constructor(value) {
this.value = value;
}
[sym](string) {
return `s/${string}/${this.value}/g`;
}
}
assert.equal('foo'.replace(new Replace1('bar')), 's/foo/bar/g');
};
exports.test_search = function(sym) {
class Search1 {
constructor(value) {
this.value = value;
}
[sym](string) {
return string.indexOf(this.value);
}
}
assert.equal('foobar'.search(new Search1('bar')), 3);
};
exports.test_species = function(sym) {
class Array1 extends Array {
static get [sym]() { return Array; }
}
const a = new Array1(1, 2, 3);
const mapped = a.map(x => x * x);
assert.equal(mapped instanceof Array1, false);
assert.ok(mapped instanceof Array);
};
exports.test_split = function(sym) {
class Split1 {
constructor(value) {
this.value = value;
}
[sym](string) {
var index = string.indexOf(this.value);
return this.value + string.substr(0, index) + "/"
+ string.substr(index + this.value.length);
}
}
assert.equal('foobar'.split(new Split1('foo')), 'foo/bar');
};
exports.test_to_primitive = function(sym) {
const object1 = {
[sym](hint) {
if (hint == 'number') {
return 42;
}
return null;
}
};
assert.equal(+object1, 42);
};
exports.test_to_string_tag = function(sym) {
class ValidatorClass {
get [sym]() {
return 'Validator';
}
}
assert.equal(Object.prototype.toString.call(new ValidatorClass()), '[object Validator]');
};
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