niim/pxtest2.js

Node Inspect IMproved

#! /usr/bin/env node

const real = [1,2,3,4,5,6,7,8,9, {hello: 'world'}];

function arrClone(arr) {
  return new Proxy([].concat(arr), {
    get: function(target, prop) {
      if (typeof prop === 'symbol')
        return target[prop];

      switch(typeof target[prop]) {
      case 'undefined':
      case 'number':
      case 'string':
      case 'boolean':
      case 'function':
      case 'symbol':
        return target[prop]; /* immutable */
      case 'object':
        return {...target[prop]};
      default:
        throw new Error('I have no idea what to do with', `(${prop})`);
      }
    },
    set: function(target, prop, value) {
      target[prop] = value;
      return true;
    }
  });
}

var px = arrClone(real);

console.log(px.filter((x) => x > 3));
console.log(px.splice(1,2));
console.log(px);
console.log(real);