Published Oct 09, 2019
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Shorter syntax for common object property definition idiom.
var x = 0, y = 0
obj = { x, y }
Support for computed names in object property definitions.
let obj = {
foo: "bar",
[ "baz" + quux() ]: 42
}
Support for method notation in object property definitions, for both regular functions and generator functions.
obj = {
foo (a, b) {
…
},
bar (x, y) {
…
},
*quux (x, y) {
…
}
}
Intuitive and flexible destructuring of Arrays into individual variables during assignment.
var list = [ 1, 2, 3 ]
var [ a, , b ] = list
[ b, a ] = [ a, b ]
Intuitive and flexible destructuring of Objects into individual variables during assignment.
var { op, lhs, rhs } = getASTNode()
Intuitive and flexible destructuring of Objects into individual variables during assignment.
var { op: a, lhs: { op: b }, rhs: c } = getASTNode()
Simple and intuitive default values for destructuring of Objects and Arrays.
var obj = { a: 1 }
var list = [ 1 ]
var { a, b = 2 } = obj
var [ x, y = 2 ] = list
Intuitive and flexible destructuring of Arrays and Objects into individual parameters during function calls.
function f ([ name, val ]) {
console.log(name, val)
}
function g ({ name: n, val: v }) {
console.log(n, v)
}
function h ({ name, val }) {
console.log(name, val)
}
f([ "bar", 42 ])
g({ name: "foo", val: 7 })
h({ name: "bar", val: 42 })
Fail-soft destructuring, optionally with defaults.
var list = [ 7, 42 ]
var [ a = 1, b = 2, c = 3, d ] = list
a === 7
b === 42
c === 3
d === undefined
References: