es5.js
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'use strict';
var test = require('tape');
var toPrimitive = require('../es5');
var is = require('object-is');
var forEach = require('foreach');
var functionName = require('function.prototype.name');
var debug = require('object-inspect');
var hasSymbols = require('has-symbols')();
test('function properties', function (t) {
t.equal(toPrimitive.length, 1, 'length is 1');
t.equal(functionName(toPrimitive), 'ToPrimitive', 'name is ToPrimitive');
t.end();
});
var primitives = [null, undefined, true, false, 0, -0, 42, NaN, Infinity, -Infinity, '', 'abc'];
test('primitives', function (t) {
forEach(primitives, function (i) {
t.ok(is(toPrimitive(i), i), 'toPrimitive(' + debug(i) + ') returns the same value');
t.ok(is(toPrimitive(i, String), i), 'toPrimitive(' + debug(i) + ', String) returns the same value');
t.ok(is(toPrimitive(i, Number), i), 'toPrimitive(' + debug(i) + ', Number) returns the same value');
});
t.end();
});
test('Symbols', { skip: !hasSymbols }, function (t) {
var symbols = [
Symbol('foo'),
Symbol.iterator,
Symbol['for']('foo') // eslint-disable-line no-restricted-properties
];
forEach(symbols, function (sym) {
t.equal(toPrimitive(sym), sym, 'toPrimitive(' + debug(sym) + ') returns the same value');
t.equal(toPrimitive(sym, String), sym, 'toPrimitive(' + debug(sym) + ', String) returns the same value');
t.equal(toPrimitive(sym, Number), sym, 'toPrimitive(' + debug(sym) + ', Number) returns the same value');
});
var primitiveSym = Symbol('primitiveSym');
var stringSym = Symbol.prototype.toString.call(primitiveSym);
var objectSym = Object(primitiveSym);
t.equal(toPrimitive(objectSym), primitiveSym, 'toPrimitive(' + debug(objectSym) + ') returns ' + debug(primitiveSym));
// This is different from ES2015, as the ES5 algorithm doesn't account for the existence of Symbols:
t.equal(toPrimitive(objectSym, String), stringSym, 'toPrimitive(' + debug(objectSym) + ', String) returns ' + debug(stringSym));
t.equal(toPrimitive(objectSym, Number), primitiveSym, 'toPrimitive(' + debug(objectSym) + ', Number) returns ' + debug(primitiveSym));
t.end();
});
test('Arrays', function (t) {
var arrays = [[], ['a', 'b'], [1, 2]];
forEach(arrays, function (arr) {
t.ok(is(toPrimitive(arr), arr.toString()), 'toPrimitive(' + debug(arr) + ') returns toString of the array');
t.equal(toPrimitive(arr, String), arr.toString(), 'toPrimitive(' + debug(arr) + ') returns toString of the array');
t.ok(is(toPrimitive(arr, Number), arr.toString()), 'toPrimitive(' + debug(arr) + ') returns toString of the array');
});
t.end();
});
test('Dates', function (t) {
var dates = [new Date(), new Date(0), new Date(NaN)];
forEach(dates, function (date) {
t.equal(toPrimitive(date), date.toString(), 'toPrimitive(' + debug(date) + ') returns toString of the date');
t.equal(toPrimitive(date, String), date.toString(), 'toPrimitive(' + debug(date) + ') returns toString of the date');
t.ok(is(toPrimitive(date, Number), date.valueOf()), 'toPrimitive(' + debug(date) + ') returns valueOf of the date');
});
t.end();
});
var coercibleObject = { valueOf: function () { return 3; }, toString: function () { return 42; } };
var valueOfOnlyObject = { valueOf: function () { return 4; }, toString: function () { return {}; } };
var toStringOnlyObject = { valueOf: function () { return {}; }, toString: function () { return 7; } };
var coercibleFnObject = {
valueOf: function () { return function valueOfFn() {}; },
toString: function () { return 42; }
};
var uncoercibleObject = { valueOf: function () { return {}; }, toString: function () { return {}; } };
var uncoercibleFnObject = {
valueOf: function () { return function valueOfFn() {}; },
toString: function () { return function toStrFn() {}; }
};
test('Objects', function (t) {
t.equal(toPrimitive(coercibleObject), coercibleObject.valueOf(), 'coercibleObject with no hint coerces to valueOf');
t.equal(toPrimitive(coercibleObject, String), coercibleObject.toString(), 'coercibleObject with hint String coerces to toString');
t.equal(toPrimitive(coercibleObject, Number), coercibleObject.valueOf(), 'coercibleObject with hint Number coerces to valueOf');
t.equal(toPrimitive(coercibleFnObject), coercibleFnObject.toString(), 'coercibleFnObject coerces to toString');
t.equal(toPrimitive(coercibleFnObject, String), coercibleFnObject.toString(), 'coercibleFnObject with hint String coerces to toString');
t.equal(toPrimitive(coercibleFnObject, Number), coercibleFnObject.toString(), 'coercibleFnObject with hint Number coerces to toString');
t.ok(is(toPrimitive({}), '[object Object]'), '{} with no hint coerces to Object#toString');
t.equal(toPrimitive({}, String), '[object Object]', '{} with hint String coerces to Object#toString');
t.ok(is(toPrimitive({}, Number), '[object Object]'), '{} with hint Number coerces to Object#toString');
t.equal(toPrimitive(toStringOnlyObject), toStringOnlyObject.toString(), 'toStringOnlyObject returns toString');
t.equal(toPrimitive(toStringOnlyObject, String), toStringOnlyObject.toString(), 'toStringOnlyObject with hint String returns toString');
t.equal(toPrimitive(toStringOnlyObject, Number), toStringOnlyObject.toString(), 'toStringOnlyObject with hint Number returns toString');
t.equal(toPrimitive(valueOfOnlyObject), valueOfOnlyObject.valueOf(), 'valueOfOnlyObject returns valueOf');
t.equal(toPrimitive(valueOfOnlyObject, String), valueOfOnlyObject.valueOf(), 'valueOfOnlyObject with hint String returns valueOf');
t.equal(toPrimitive(valueOfOnlyObject, Number), valueOfOnlyObject.valueOf(), 'valueOfOnlyObject with hint Number returns valueOf');
t.test('exceptions', function (st) {
st['throws'](toPrimitive.bind(null, uncoercibleObject), TypeError, 'uncoercibleObject throws a TypeError');
st['throws'](toPrimitive.bind(null, uncoercibleObject, String), TypeError, 'uncoercibleObject with hint String throws a TypeError');
st['throws'](toPrimitive.bind(null, uncoercibleObject, Number), TypeError, 'uncoercibleObject with hint Number throws a TypeError');
st['throws'](toPrimitive.bind(null, uncoercibleFnObject), TypeError, 'uncoercibleFnObject throws a TypeError');
st['throws'](toPrimitive.bind(null, uncoercibleFnObject, String), TypeError, 'uncoercibleFnObject with hint String throws a TypeError');
st['throws'](toPrimitive.bind(null, uncoercibleFnObject, Number), TypeError, 'uncoercibleFnObject with hint Number throws a TypeError');
st.end();
});
t.end();
});