ECMAScript support

EcmaScript 5.1

Full support.

ECMAScript 2016+

arrow functions MDN.
async/await ECMAScript tc39.
classes declarations ECMAScript 6, MDN.
class private fields MDN..
computed property names ECMAScript 6, MDN.
destructuring parameters and assignments MDN.
for...of statements ECMAScript 6, MDN.
function default parameters MDN.
function rest parameters MDN.
generators ECMAScript 6, MDN.
let and const bindings (complete) ECMAScript 6, MDN.
modules (import and export) ECMAScript 6, ECMAScript 2018, MDN, MDN.
map/weakmap ECMAScript 6, ECMAScript 6, MDN, MDN.
new.target MDN.
set/weakset ECMAScript 6, ECMAScript 6, MDN, MDN.
spread syntax MDN.
symbols.
promises ECMAScript 6, MDN.
proxy objects ECMAScript 6, MDN.
reflect ECMAScript 6, MDN.
template strings ECMAScript 6 tagged, ECMAScript 6, MDN.
typed arrays.
BigInt ECMAScript 2021 MDN.
?? and ?. operators MDN, MDN.

Regular expressions flags are only partially supported. The flags d', s', 'v', and 'y' are ignored.

Extensions

Hop extends some standard JavaScript classes.

String.prototype.naturalCompare( string1, string1 )

This function compares string1 and string2 according to a natural string order. It returns a negative integer if string1 < string2. It returns zero if the string1 equal string2. It returns a positive integer if string1 > string2.

Examples:

"foo".naturalCompare( "foo" ) -> 0
"foo0".naturalCompare( "foo1" ) -> -1
"foo1".naturalCompare( "foo" ) -> 1
"rfc822.txt".naturalCompare( "rfc1.txt" ) -> -1
"1.002".naturalCompare( "1.010" ) -> -1

Array.prototype.filterMap( proc, [ thisArg ] )

As Array.prototype.map but filters out elements for which proc returns false.