js.es6.jsver

Tests or returns the JavaScript version by (ECMAScript) starting with ES2. (MIT license)

Why 'js.es6.jsver' when 'starting with ES2'?

• jsver() support ES2+ (index.js#jsver())
• jsvero() support ES6+ and requires jsver()
• jsver.js in Releases uses ES6+ code for module:main with jsvero() and can be uses from web-browser, node (interactive, command-line and require(), eval);

Examples

const { jsver } = require('jsver'); //const jsver = require('jsver').jsver;
const { jsvero } = require('jsver'); //const jsvero = require('jsver').jsvero //const jsvero = require('jsver').o;

jsver vs jsvero

jsvero: returns Object{} and written for ES6+ jsver: returns Object[] and written for ES2+

jsvero().name == jsver()[2];
jsvero().ver == jsver()[0];
jsvero().year == jsver()[1];
jsvero().best == jsver(true); //is best version that jsver() known?

Params

jsver(6) //(jsvero().ver==jsver(6));
jsver(2023) //(jsvero().year==2023)
jsver('ECMAScript 2023') //(jsvero().name=='ECMAScript 2023');
jsver(false) //or jsver('false') //is latest JavaScript? (false)->yes=>false|no->true or (true)->yes->true|no->false
jsver() //returns [in_standard_ver,standard_year,standard_name];

see jsver docstring jsver and jsvero params is equal

Recepies

if (require('jsver').jsvero()!=4) {
  console.log('this script requires ES4');
  process.exit(0); //terminate node process; .abort() for force terminate
}

//script.src=jsver_path.js or require('jsver')
if (jsver()[0]!=4) {
  console.log('this script requires ES4');
}

if (jsvero()<6) {
  console.log('this script requires ES6+ support');
  process.exit(0);
}