NativeScript V8 JavaScriptCore
Minor difference (1 point) Small feature (2 points) Medium feature (4 points) Large feature (8 points)
NativeScript Desktop browsers
Feature name Current browser NS 6.0 Android
v8
NS 6.1 Android
v8
NS Next Android
v8
NS 6.0 iOS
JavaScriptCore
NS 6.1 iOS
JavaScriptCore
NS Next iOS
v8
CH 77,
OP 64
CH 79,
OP 66
SF 13 Beta SF TP
2016 features
§exponentiation (**) operator MDN (Mozilla Development Network) logo  3/3 3/3 3/3 3/3 3/3 3/3 3/3 3/3 3/3 3/3
§basic support Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes
§assignment Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes
§early syntax error for unary negation without parens Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes
§Array.prototype.includes MDN (Mozilla Development Network) logo  3/3 3/3 3/3 3/3 3/3 3/3 3/3 3/3 3/3 3/3
§Array.prototype.includes MDN (Mozilla Development Network) logo  Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes
§Array.prototype.includes is generic Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes
§%TypedArray%.prototype.includes MDN (Mozilla Development Network) logo  Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes
2016 misc
§generator functions can't be used with "new" MDN (Mozilla Development Network) logo [1] Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes
§generator throw() caught by inner generator MDN (Mozilla Development Network) logo [2] Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes
§strict fn w/ non-strict non-simple params is error[3] Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes
§nested rest destructuring, declarations MDN (Mozilla Development Network) logo [4] Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes
§nested rest destructuring, parameters[5] Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes
§Proxy, "enumerate" handler removed MDN (Mozilla Development Network) logo [6] Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes
§Proxy internal calls, Array.prototype.includes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes
2017 features
§Object static methods 4/4 4/4 4/4 4/4 4/4 4/4 4/4 4/4 4/4 4/4
§Object.values MDN (Mozilla Development Network) logo  Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes
§Object.entries MDN (Mozilla Development Network) logo  Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes
§Object.getOwnPropertyDescriptors MDN (Mozilla Development Network) logo  Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes
§Object.getOwnPropertyDescriptors doesn't provide undefined descriptors Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes
§String padding 2/2 2/2 2/2 2/2 2/2 2/2 2/2 2/2 2/2 2/2
§String.prototype.padStart MDN (Mozilla Development Network) logo  Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes
§String.prototype.padEnd MDN (Mozilla Development Network) logo  Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes
§trailing commas in function syntax MDN (Mozilla Development Network) logo  2/2 2/2 2/2 2/2 2/2 2/2 2/2 2/2 2/2 2/2
§in parameter lists MDN (Mozilla Development Network) logo  Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes
§in argument lists MDN (Mozilla Development Network) logo  Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes
§async functions MDN (Mozilla Development Network) logo  16/16 16/16 16/16 16/16 16/16 16/16 16/16 16/16 16/16 16/16
§return Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes
§throw Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes
§no line break between async and function Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes
§no "prototype" property Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes
§await MDN (Mozilla Development Network) logo  Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes
§await, rejection Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes
§must await a value Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes
§can await non-Promise values Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes
§cannot await in parameters Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes
§async methods, object literals Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes
§async methods, classes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes
§async arrow functions in methods, classes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes
§async arrow functions Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes
§correct prototype chain Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes
§async function prototype, Symbol.toStringTag Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes
§async function constructor Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes
§shared memory and atomics 17/17 17/17 17/17 0/17 0/17 17/17 17/17 17/17 0/17 0/17
§SharedArrayBuffer MDN (Mozilla Development Network) logo  Yes Yes Yes No No Yes Yes Yes No[7] No[7]
§SharedArrayBuffer[Symbol.species] Yes Yes Yes No No Yes Yes Yes No[7] No[7]
§SharedArrayBuffer.prototype.byteLength MDN (Mozilla Development Network) logo  Yes Yes Yes No No Yes Yes Yes No[7] No[7]
§SharedArrayBuffer.prototype.slice MDN (Mozilla Development Network) logo  Yes Yes Yes No No Yes Yes Yes No[7] No[7]
§SharedArrayBuffer.prototype[Symbol.toStringTag] Yes Yes Yes No No Yes Yes Yes No[7] No[7]
§Atomics.add MDN (Mozilla Development Network) logo  Yes Yes Yes No No Yes Yes Yes No[7] No[7]
§Atomics.and MDN (Mozilla Development Network) logo  Yes Yes Yes No No Yes Yes Yes No[7] No[7]
§Atomics.compareExchange MDN (Mozilla Development Network) logo  Yes Yes Yes No No Yes Yes Yes No[7] No[7]
§Atomics.exchange MDN (Mozilla Development Network) logo  Yes Yes Yes No No Yes Yes Yes No[7] No[7]
§Atomics.wait MDN (Mozilla Development Network) logo  Yes Yes Yes No No Yes Yes Yes No[7] No[7]
§Atomics.wake MDN (Mozilla Development Network) logo  Yes Yes Yes No No Yes Yes Yes No[7] No[7]
§Atomics.isLockFree MDN (Mozilla Development Network) logo  Yes Yes Yes No No Yes Yes Yes No[7] No[7]
§Atomics.load MDN (Mozilla Development Network) logo  Yes Yes Yes No No Yes Yes Yes No[7] No[7]
§Atomics.or MDN (Mozilla Development Network) logo  Yes Yes Yes No No Yes Yes Yes No[7] No[7]
§Atomics.store MDN (Mozilla Development Network) logo  Yes Yes Yes No No Yes Yes Yes No[7] No[7]
§Atomics.sub MDN (Mozilla Development Network) logo  Yes Yes Yes No No Yes Yes Yes No[7] No[7]
§Atomics.xor MDN (Mozilla Development Network) logo  Yes Yes Yes No No Yes Yes Yes No[7] No[7]
2017 misc
§Proxy "ownKeys" handler, duplicate keys for non-extensible targets (ES 2017 semantics) MDN (Mozilla Development Network) logo [8] No No No Yes Yes No No No No No
§RegExp "u" flag, case folding No No No Yes Yes No Yes Yes Yes Yes
§arguments.caller removed MDN (Mozilla Development Network) logo  Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes
2017 annex b
§Object.prototype getter/setter methods 16/16 16/16 16/16 16/16 16/16 16/16 16/16 16/16 16/16 16/16
§__defineGetter__ MDN (Mozilla Development Network) logo  Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes
§__defineGetter__, symbols Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes
§__defineGetter__, ToObject(this) Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes
§__defineSetter__ MDN (Mozilla Development Network) logo  Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes
§__defineSetter__, symbols Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes
§__defineSetter__, ToObject(this) Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes
§__lookupGetter__ MDN (Mozilla Development Network) logo  Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes
§__lookupGetter__, prototype chain Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes
§__lookupGetter__, symbols Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes
§__lookupGetter__, ToObject(this) Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes
§__lookupGetter__, data properties can shadow accessors Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes
§__lookupSetter__ MDN (Mozilla Development Network) logo  Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes
§__lookupSetter__, prototype chain Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes
§__lookupSetter__, symbols Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes
§__lookupSetter__, ToObject(this) Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes
§__lookupSetter__, data properties can shadow accessors Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes
§Proxy internal calls, getter/setter methods 4/4 4/4 4/4 4/4 4/4 4/4 4/4 4/4 4/4 4/4
§__defineGetter__ Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes
§__defineSetter__ Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes
§__lookupGetter__ Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes
§__lookupSetter__ Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes
§assignments allowed in for-in head in non-strict mode MDN (Mozilla Development Network) logo  Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes
2018 features
§object rest/spread properties 2/2 2/2 2/2 2/2 2/2 2/2 2/2 2/2 2/2 2/2
§object rest properties Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes
§object spread properties Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes
§Promise.prototype.finally MDN (Mozilla Development Network) logo  3/3 3/3 3/3 3/3 3/3 3/3 3/3 3/3 3/3 3/3
§basic support Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes
§don't change resolution value Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes
§change rejection value Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes
§s (dotAll) flag for regular expressions Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes
§RegExp named capture groups Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes
§RegExp Lookbehind Assertions Yes Yes Yes No No Yes Yes Yes No No
§RegExp Unicode Property Escapes No No No Yes Yes No Yes Yes Yes Yes
§Asynchronous Iterators 2/2 2/2 2/2 2/2 2/2 2/2 2/2 2/2 2/2 2/2
§async generators Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes
§for-await-of loops MDN (Mozilla Development Network) logo  Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes
2018 misc
§template literal revision Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes
2019 features
§Object.fromEntries MDN (Mozilla Development Network) logo  Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes
§string trimming 4/4 4/4 4/4 4/4 4/4 4/4 4/4 4/4 4/4 4/4
§String.prototype.trimLeft MDN (Mozilla Development Network) logo  Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes
§String.prototype.trimRight MDN (Mozilla Development Network) logo  Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes
§String.prototype.trimStart MDN (Mozilla Development Network) logo  Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes
§String.prototype.trimEnd MDN (Mozilla Development Network) logo  Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes
§Array.prototype.{flat, flatMap}[9] 3/3 3/3 3/3 2/3 2/3 3/3 3/3 3/3 3/3 3/3
§Array.prototype.flat MDN (Mozilla Development Network) logo  Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes
§Array.prototype.flatMap MDN (Mozilla Development Network) logo  Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes
§flat and flatMap in Array.prototype[@@unscopables] Yes Yes Yes No No Yes Yes Yes Yes Yes
2019 misc
§optional catch binding 3/3 3/3 3/3 3/3 3/3 3/3 3/3 3/3 3/3 3/3
§basic Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes
§await Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes
§yield Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes
§Symbol.prototype.description MDN (Mozilla Development Network) logo  3/3 3/3 3/3 3/3 3/3 3/3 3/3 3/3 3/3 3/3
§basic Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes
§empty description Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes
§undefined description Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes
§Function.prototype.toString revision MDN (Mozilla Development Network) logo  7/7 7/7 7/7 4/7 4/7 7/7 7/7 7/7 4/7 4/7
§functions created with the Function constructor Yes Yes Yes No No Yes Yes Yes No No
§arrows Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes
§[native code] Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes
§class expression with implicit constructor Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes
§class expression with explicit constructor Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes
§unicode escape sequences in identifiers Yes Yes Yes No No Yes Yes Yes No No
§methods and computed property names Yes Yes Yes No No Yes Yes Yes No No
§JSON superset 2/2 2/2 2/2 2/2 2/2 2/2 2/2 2/2 2/2 2/2
§LINE SEPARATOR can appear in string literals Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes
§PARAGRAPH SEPARATOR can appear in string literals Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes
§Well-formed JSON.stringify MDN (Mozilla Development Network) logo  Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes
2020 features
§String.prototype.matchAll MDN (Mozilla Development Network) logo  Yes Yes Yes No No Yes Yes Yes Yes Yes
§Promise.allSettled No No No No No No Yes Yes Yes Yes
Thanks to Kangax, webspacedspace, zloirock and the rest of the people who contributed to Kangax ES Compatibility Table

This site uses the base of the awesome compat-table and adds all the code to handle the additional testing on the NativeScript runtimes, and ability to export the data and collate it back to these tables...

[1] TC39 meeting notes from July 28, 2015.

[2] 'Semantics of yield* in throw case' GitHub issue in ECMA-262 repo.

[3] TC39 meeting notes from July 29, 2015.

[4] TC39 meeting notes from July 28, 2015.

[5] TC39 meeting notes from July 28, 2015.

[6] 'Normative: Remove [[Enumerate]] and associated reflective capabilities' GitHub Pull Request in ECMA-262 repo.

[7] The feature was temporarily disabled to mitigate the Meltdown and Spectre CPU bugs.

[8] The behaviour of the Proxy “ownKeys” handler in presence of duplicate keys has been modified later.

[9] Name of Array.prototype.flatten() changed to Array.prototype.flat() due to web compatibility issues.