Table of Contents

• ECMAScript support
• EcmaScript 5.1
• ECMAScript 2016+
• Extensions
• String.prototype.naturalCompare( string1, string1 )
• Array.prototype.filterMap( proc, [ thisArg ] )

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.

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.

Examples:

[1, -1, 2, -3 ].filterMap( x => x > 0 ? x * 10 : false ) -> [ 10, 20 ]
[1, -1, 2, -3 ].map( x => x > 0 ? x * 10 : 0 ) -> [ 10, 0, 20, 0 ]