reflect.js

// ref: https://github.com/toshok/echo-js/blob/e9d3c55cd9eb852c627d1bd0f28972b99a137a40/runtime/ejs-reflect.c

let foo = {
  bar: 123
};
let sym = Symbol('test')
foo[sym] = 456

// Reflect.get
console.log(Reflect.get(foo, 'bar')) // => 123
console.log(Reflect.get(foo, sym)) // => 456

// Reflect.set
Reflect.set(foo, 'var', 789)
console.log(Reflect.get(foo, 'var')) // => 789

// Reflect.has
console.log(Reflect.has(foo, 'bar')) // => true

/*
// not implemented in echo-js
// Reflect.deleteProperty
Reflect.deleteProperty(foo, 'var')
console.log('var' in foo) // => undefined
*/

// Reflect.getOwnPropertyDescriptor
let desc = Reflect.getOwnPropertyDescriptor(foo, 'bar')
console.log(desc.value) // => 123

/*
// not implemented in echo-js
// Reflect.defineProperty
Reflect.defineProperty(foo, 'var', { value: 345, writable: false })
console.log(foo.var)
*/

// Reflect.getPrototypeOf, Reflect.setPrototypeOf
let obj = {}
Reflect.setPrototypeOf(obj, Array.prototype)
console.log(Reflect.getPrototypeOf(obj) === Array.prototype) // => true

// Reflect.isExtensible, Reflect.preventExtensions
Reflect.preventExtensions(obj)
console.log(Reflect.isExtensible(obj)) // => false

/*
// not implemented in echo-js
// Reflect.enumerate
for (let item in Reflect.enumerate(foo)) {
  console.log(foo)
}
*/

// Reflect.ownKeys
// why symbol key returns as 0 in echo-js?
console.log(Reflect.ownKeys(foo)) // => [ bar, var, 0 ]

// Reflect.apply
let arr = [1, 2]
Reflect.apply(Array.prototype.push, arr, [3, 4, 5])
console.log(arr) // => [ 1, 2, 3, 4, 5 ]

/*
// not implemented in echo-js
// Reflect.construct
class C {
  constructor() {
    this.x = 1
  }
}
console.log(Reflect.construct(C).x) // => 1
*/