Testing polyfill for URLSearchParams

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urlsearchparams.es6

(function(url) {
	/**
	 * @see https://developer.mozilla.org/en-US/docs/Web/API/URLSearchParams
	 */
	class URLSearchParamsX extends Map {
		constructor(url = '') {
			super();
			url.split('&').forEach(item => {
				let [key, value] = item.split('=');
				this.append(decodeURIComponent(key), decodeURIComponent(value));
			});
		}
		toString() {
			console.log(this);
			let query = [];
			for (let key of this.keys()) {
				this.getAll(key).forEach(value => {
					query.push(`${encodeURIComponent(key)}=${encodeURIComponent(value)}`);
				});
			}
			return query.join('&').replace(/%20/g, '+')
		set(key, value) {
			return super.set(key, [value]);
		}
		append(key, value) {
			if (this.has(key)) {
				let values = super.get(key);
				values.push(value);
				return super.set(key, values);
			} else {
				return this.set(key, value);
			}
		}
		get(key) {
			return super.get(key)[0];
		}
		getAll(key) {
			return this.has(key) ? super.get(key) : [];
		}
		*values() {
			for (let key of this.keys()) {
				yield this.get(key);
			}
		}
		*entries() {
			for (let key of this.keys()) {
				yield [key, this.get(key)];
			}
		}
	}
	let shim = new URLSearchParamsX(url);
	let native = new URLSearchParams(url);
	console.info({
		"shim.set(name, Chris)": shim.set('name', 'Chris'),
		"native.set(name, Chris)": native.set('name', 'Chris'),
		"shim.append(foo, baz)": shim.append('foo', 'baz'),
		"native.append(foo, baz)": native.append('foo', 'baz'),
		"shim.getAll(foo)": shim.getAll('foo'),
		"native.getAll(foo)": native.getAll('foo'),
		"shim.has(name)": shim.has('name'),
		"native.has(name)": native.has('name'),
		"shim.delete(foo)": shim.delete('foo'),
		"native.delete(foo)": native.delete('foo'),
		"shim.has(foo)": shim.has('foo'),
		"native.has(foo)": native.has('foo'),
		"native.set(foo, bar)": native.set('foo', 'bar'),
		"shim.set(foo, bar)": shim.set('foo', 'bar'),
		"shim.toString()": shim.toString(),
		"native.toString()": native.toString()
	});

})('foo=bar&bar=baz+foo&bar=sjkfg');