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63 lines
1.4 KiB
JavaScript
63 lines
1.4 KiB
JavaScript
// modules
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import foo from 'bar';
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function foo(
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x = 23, // default function parameters
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...rest // rest parameters
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) {}
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Math.max(...[1, 2, 3]); // spread (...) operator
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var x = 23;
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var o = {
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__proto__: [], // object literal extensions
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x, // object literal extensions
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foo() {}, // object literal extensions
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[x]: x // object literal extensions
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};
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for (var x of xs); // for..of loops
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0b11001001; // octal and binary literals
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0o2412; // octal and binary literals
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`template`; // template literals
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/a/y; // RegExp "y" and "u" flags
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/a/u; // RegExp "y" and "u" flags
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var [y] = o; // destructuring declarations
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[y] = y; // destructuring assignment
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(function (
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{x:y} // destructuring parameters
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) {})(o);
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"\u{1f63c}"; // Unicode code point escapes
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"\udead";
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"\\u{1f63c}";
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const pi = 22/7; // const
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let z = x+1; // let
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[1, 2, 3].map(
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x => x*2 // arrow functions
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);
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class Super { // class
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constructor(x) { console.log(x); }
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}
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class Sub { // class
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constructor() {
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super(42); // super
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}
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}
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function* gen() { // generators
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yield 42; // generators
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yield* gen; // generators
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new.target; // new.target
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}
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!class extends Super {} // class
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