Testing JavaScript 1.7 - To index of all tests and compatibility tables

Generators

function double5() {
	var i=0, j=5, k;
	while (true) {
		yield i;
		k = i;
		i = j;
		j += i;
	}
}

var g = double5(),
	resultValues = [];
for (var i=0; i<5; i++) {
	resultValues.push(g.next());
}

Result: FAILED

Works in:

• 2.0+

Iterators

var lostInfo = {
	name : "Lost",
	location : "Island",
	numbers : "4 8 15 16 23 42"
};

var iteratorObj = Iterator(lostInfo),
	resultValues = [],
	next;
try{
	while (true) {
		next = iteratorObj.next();
		resultValues.push(next[0] + ": " + next[1]);
	}
}
catch (err if err instanceof StopIteration) {  
	resultValues.push("END OF LIST");
}
catch (err) {  
	resultValues.push("UNKNOWN ERROR");
}

Result: FAILED

var lostInfo = {
	name : "Lost",
	location : "Island",
	numbers : "4 8 15 16 23 42"
};

// Notice true below - will return only parameter names and not values, as opposed to the example above
var iteratorObj = Iterator(lostInfo, true),
	resultValues = [];
try{
	while (true) {
		resultValues.push(iteratorObj.next());
	}
}
catch (err if err instanceof StopIteration) {  
	resultValues.push("END OF LIST");
}
catch (err) {  
	resultValues.push("UNKNOWN ERROR");
}

Result: FAILED

Works in:

• 2.0+

function setVal (start, end) {
	for (let i=start; i<end; ++i) {
		yield i;
	}
}
var evenValues = [i for each (i in setVal(0, 15)) if (i % 2 == 0)];

Result: FAILED

Works in:

• 2.0+

let statement

var x = 5,
	y = 7,
	resultValues = ["Before let statement: " + x + ", " + y];
	
let (x=15, y=12) {
	resultValues.push("In let statement: " + x + ", " + y);
}

resultValues.push("After let statement: " + x + ", " + y);

Result: FAILED

Works in:

• 2.0+

let expression

var x = 1,
	y = 3,
	resultValues = ["Before let expression: " + x + ", " + y];
	
let (x=7, y=8) resultValues.push("In let expression: " + x + ", " + y);

resultValues.push("After let expression: " + x + ", " + y);

Result: FAILED

Works in:

• 2.0+

let definition

var letDefinitionResults = 
		document.getElementById("results-let-definition"),
	item;
for (var i=0; i<5; i++) {
	item = document.createElement("div");
	item.innerHTML = "Click me - I will say " + i;
	let j = i;
	item.onclick = function () {
		alert("I am " + j);
	};
	letDefinitionResults.appendChild(item);
}

Result: FAILED

Works in:

• 2.0+

var a = 1,
	b = 2;
// Value swapping	
[a, b] = [b, a];

Result: FAILED

var a = 1,
	b = 2,
	c = 3,
	d = 4;
// Value swapping	
[a, b, c, d] = [d, c, b, a];

Result: FAILED

var a = 1,
	b = 2;

function newValues () {
	return [10, 20];
}					
	
// Assigning new values
[a, b] = newValues();

Result: FAILED

var a = 1,
	b = 2;

function newValues () {
	return [10, 20, 30];
}					

// Assigning new values, ignoring the second one
[a, , b] = newValues();

Result: FAILED

Works in:

• 2.0+
• 9.5+ (partial support, some combinations don't work)

var griffins = {
	father : "Peter",
	mother : "Lois",
	son : "Chris",
	daugher : "Meg",
	baby : "Stewie",
	dog : "Brian"
},
	resultValues = [];

for (let [type, name] in Iterator(griffins)) {
	resultValues.push(type + ": " + name);
}

Result: FAILED

Works in:

• 2.0+