deep-inspect

deep-inspect

A function to inspect inherited properties as well

Installation

npm install deep-inspect

Options

The second argument to this function will be an options object. It accepts the following values. Please note that all are optional fields.

• showHidden
• depth
• parentChainLevel

See below for explanations of the options.

showHidden

Setting this option to true will show all the enumerable properties of the object. Normally, when you iterate an object with a for..in loop or with Object.keys, the non-enumerable properties will not be shown.

This must be a boolean value and the default value is false.

depth

If the object is nested structure or the object has many child properties then setting this option to a valid positive 32 bit integer value, will list all the properties of the nested structure as well, till the level specified by depth is reached.

This must be a valid 32 bit integer value and the default value is 1.

parentChainLevel

This option allows to explore the inheritance chain as well. It will go to the depth mentioned in parentChainLevel and list down all the properties of all the objects on the way.

There is no default value, but if not provided this will be ignored and none of the parent objects in the prototype chain will be inspected.

Usage

Inspecting primitives

var inspect = require('deep-inspect');
inspect(1);
// 1
inspect('thefourtheye');
// "thefourtheye"
inspect();
// undefined

Inspecting simple objects

var inspect = require('deep-inspect');
inspect([]);
// []
inspect({});
// {}
inspect({1: '2'});
// Object
// └─┬ Key: "1"',
//   └── "2"'

Inspecting hidden (non-enumerable) properties

var inspect = require('deep-inspect');
var a = {};
Object.defineProperties(a, {
    one: {enumerable: true,  value: 'one'},
    two: {enumerable: false, value: 'two'},
});
inspect(a, {showHidden: true});
// Object
// ├─┬ Key: "one"
// │ └── "one"
// └─┬ Key: "two"
//   └── "two"
inspect(a);
// Object
// └─┬ Key: "one"
//   └── "one"

Inspecting inheritance chain (inherited properties)

var inspect = require('deep-inspect');
function Parent() {}
Parent.prototype.name = 'Parent';

function Child() {}
Child.prototype = Object.create(Parent.prototype);
Child.prototype.constructor = Child;

inspect(new Child(), {parentChainLevel: 4});
// Object
// └─┬ [[Parent]] : Object
//   ├─┬ [[Parent]] : Object
//   │ ├─┬ [[Parent]] : Object
//   │ │ └── [[Parent]] : null
//   │ └─┬ Key: "name"
//   │   └── "Parent"
//   └─┬ Key: "constructor"
//     └── [Function Child]