Testing JavaScript 1.8 - To index of all tests and compatibility tables
Below I have tested the new features in JavaScript 1.8. The code below is also run immediately as you load the page, so you will see the actual results as well. Below each test is the web browsers it works in, and the minimum version of it required.
More information about JavaScript 1.8
Expression closures
// Notice the omission of braces and return statement function expressionClosure () "Yeah, ok"
Result: FAILED
Works in:
-
3.0+
Generator expressions
var animals = {
dog : "Nice",
cat : "Independent",
horse : "big"
},
resultValues = [],
iterating = (i + 3 for (i in animals));
try {
while (true) {
resultValues.push(iterating.next());
}
}
catch (err if err instanceof StopIteration) {
resultValues.push("END OF LIST");
}
Result: FAILED
Works in:
-
3.0+
Array extras
reduce
var numbers = [1, 2, 3, 4, 5],
returnValues = [];
numbers.reduce(function (prev, current, index, array) {
returnValues.push("Previous: " + prev + ", current: " + current + ", index: " + index);
return current;
});
Result: FAILED
Works in:
-
3.0+
-
4.0+
-
4.0+
reduceRight
var numbers = [1, 2, 3, 4, 5],
returnValues = [];
numbers.reduceRight(function (prev, current, index, array) {
returnValues.push("Previous: " + prev + ", current: " + current + ", index: " + index);
return current;
});
Result: FAILED
Works in:
-
3.0+
-
4.0+
-
4.0+