object-match-maker

Documentation

object-match-maker

Create an object using data from two other objects. Get what you want from either objects and update what you want from either object. Returns a promise.

Node from developer:

Don’t Forget

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Install

npm install object-match-maker --save

const {ObjectMatchMaker} = require('object-match-maker');

File Structure

object-match-maker/
./index
./test/
./package.json
./README.md

Testing

node test test_1

Test from test_1 through test_8. And I added test_51 for kicks. Do not forget the underscore. If you don't add a test argument, it will default to test_51.

Syntax

ObjectMatchMaker(
obj = [{}, {}], 
output_type=2, 
get_values_from = 0, 
this_is_the_rest = 0, 
keys_to_update=[])
.then(res => {
   		 console.log(res, ' from ', arg)
})

• obj is an array of the two objects that you want to work with.
• output_type - by default, OMM (object-match_maker) will output an array and an object. You can decide which one you want to work with by simply adding a second argument of 0 or 1 respectfully. 0 is to return an array, 1 is to return an object. 2 or any other values, including empty, is to return both. . Examples below.
• get_values_from - which element you want to get the value from. If you want to get the value from the first object or the second object. Examples below.
• this_is_the_rest - OMM mostly focus on similarities. The differences are largely disregarded. If you want the difference, regardless if it matches both objects or not, then you will apply a 0 or 1 to state where the rest of the data are coming from. Examples below.
• keys_to_update - just in case you may want to go deeper into the object to update specific keys instead of updating everything. This_is_the_rest and keys_to_update makes OMM very powerful and useful.

Uses Cases

Below, I will explain how to use each argument.

• Object a and an object b have different first level keys.
• Except for “ab”. There is a key “ab” on both objects.
• Very important. Because, most of the use cases are going to show you how to use Object Oriented to help create a new object that updates ab.

let a = {
    aa: {
        aaa: 1,
        aab: 2, 
        aac: 3
    }, 
    ab: {
        aaa: 4,
        aab: 5, 
        aac: 6
    }, 
    ac: {
        aaa: 7,
        aab: 8, 
        aac: 9
    }, 
}
let b = {
    ba: {
        aaa: 10,
        aab: 11, 
        aac: 12
    }, 
    ab: {
        aaa: 13,
        aab: 14, 
        aac: 15
    }, 
    bc: {
        aaa: 16,
        aab: 17, 
        aac: 18
    }, 
}

Case 1: argument 1, obj

node test test_1

• Imagine, object A was a newly created object.
• object B was coming from the database.
• And you do not want to override what is already on the database.
• You simply wanted to add the new data (a) to the existing data (b).

Here's the solution:

let c = ObjectMatchMaker([a,b])

console.log(c) 

output: 
[ [ { aaa: 13, aab: 14, aac: 15 },
    { aaa: 1, aab: 2, aac: 3 },
    { aaa: 7, aab: 8, aac: 9 } ],
  { ab: { aaa: 13, aab: 14, aac: 15 },
    aa: { aaa: 1, aab: 2, aac: 3 },
    ac: { aaa: 7, aab: 8, aac: 9 } } 
]

case 2: argument 2, outputting an array only.

node test test_2

Do not panic.

• You just output the solution as an object and as an array.
• If you only want the object, you will simply add a second argument of 1
• and if you wanted only the array, you will add a second parameter of 0
• If you want both, you may leave it empty or add a second parameter of 2.

Let's run it again with a second argument of 0. This should output an array instead of array and object.

let c = ObjectMatchMaker([a,b],0)

console.log(c) 

output: 
[ { aaa: 13, aab: 14, aac: 15 },
  { aaa: 1, aab: 2, aac: 3 },
  { aaa: 7, aab: 8, aac: 9 } ]

case 3: output an object only.

node test test_3

• Let's say you wanted to output an object instead of an array.
• You will simply add a second argument of 1.

let c = ObjectMatchMaker([a,b],1)

console.log(c) 

output: 
{ ab: { aaa: 13, aab: 14, aac: 15 },
  aa: { aaa: 1, aab: 2, aac: 3 },
  ac: { aaa: 7, aab: 8, aac: 9 } } 

I implemented this feature because I found myself needing either an object or an array. Depending on the circumstances. Hopefully, this feature will also help you.

Understanding the result

• The result, object c, should contain
• ab from object b.
• aa from object a
• ac from object a This is because object a is the new object and you may:
• Not want to override ab from object b.
• Object b may have additional information that object cannot pocess yet.
• Such as created_at.
• Or current_status.
• Or view_count
• Etc.

However, overriding object b should be your choice. Not mine. Therefore, I have implemented ways to override values from an object.

Case 4: get_values_from object “b”

From test script, run: node test test_4

Now, lets say, you only wanted to update object b. And you do not want to add new keys to it.

• This will mean that you will only take keys that match object a and object b.
• The rest of the keys from object that does not match object b will be disregarded.
• Remember, before you have took from b and add to a.
• This time, you will only take from a to update b.
• The rest of a, that does not match b, should be set aside.

For this solution, you will have to add a third argument of 0 or 1.

let c = ObjectMatchMaker([a,b],1,1)

console.log(c) 

{ ab: { aaa: 4, aab: 5, aac: 6 },
  ba: { aaa: 10, aab: 11, aac: 12 },
  bc: { aaa: 16, aab: 17, aac: 18 } }

As you can see, ab is coming from object a. And ba, and bc is coming from object b.

• This argument is called, get_values_from.
• This is because we are getting values from B and we are updating B with object A.
• and we are disregarding the keys that do not match B.

Case 5: get_values_from object a

node test test_5

Instead of getting values from b, you may want to get value from a. Therefore, you will turn the third argument into a 0, instead of 1

• Object-match-maker actually returned a promise.
• Therefore, you can use "then" statement.
• This will run, after your object has been resolved.

ObjectMatchMaker([a, b], 0,0).then(output => 
    console.log(output)
)

[ { aaa: 13, aab: 14, aac: 15 },
  { aaa: 1, aab: 2, aac: 3 },
  { aaa: 7, aab: 8, aac: 9 } ]

6 this_is_the_rest

From test script, run: node test test_6

• argument 4 is called, "this_is_the_rest" because it gets the rest of the keys, regardless if they matches.
• But, you have to tell it, where to get the rest of the keys from.
• Object a or b.
• based on the position of the first argument.
• Therefore, you will enter a 0 or 1.

ObjectMatchMaker([a, b], 1,0, 0).then(output => 
    console.log(output)
)

{ ab: { aaa: 13, aab: 14, aac: 15 },
  aa: { aaa: 1, aab: 2, aac: 3 },
  ac: { aaa: 7, aab: 8, aac: 9 } }

• In this instance, case 6 does not have a significant difference.
• Because we are getting values from 0 and we want the rest of 0.
• We already have the rest of 0. Because we are getting values from 0.
• But, in case 7, you will see a big difference.

7 this_is_the_rest

node test test_7

If you wanted to get the key /value pair from object A, and get the rest of the values from B, You will add a fourth argument of 1

This make OMM very powerful. Here's why.

• Imagine, object C is meant to include all of object A and all of Object B.
• But, you want object A to be updated with keys that match object B.
• Hence., the existing data from the database will remain the same, but I want to add new data.

You can simply make object C includes data from A and B and update the data. let's run this.

ObjectMatchMaker([a, b], 1,0, 1).then(output => 
    console.log(output)
)

{ ab: { aaa: 13, aab: 14, aac: 15 },
  aa: { aaa: 1, aab: 2, aac: 3 },
  ac: { aaa: 7, aab: 8, aac: 9 },
  ba: { aaa: 10, aab: 11, aac: 12 },
  bc: { aaa: 16, aab: 17, aac: 18 } }

• First, notice we have 5 keys and not 6.

• That is because AB was updated. And it was updated by AB from object B.

• And also notice that all of the keys are blend into 1.

• This is because we are getting already getting all the values from object and we said, we also want values from object b.

  8 keys_to_update

node test test_8

• This is my favorite feature because we can update particular second level keys.
• Let's say, you do not want to update everything that matches a and b.
• You only wanted to update a few keys.
• For example, lets say, I want to update a key called updated_at, product_status.
• And every other 2nd level keys should not be updated.
• In this case, you will add a fifth argument that contains an array of the keys that must be updated.

let test_8 =[ [a, b], 1,0, 1, ['aaa', 'aac']]

ObjectMatchMaker(...test_8).then(res => {
    console.log(res)

})

output:

{ ab: { aaa: 4, aab: 14, aac: 6 },
  aa: { aaa: 1, aab: 2, aac: 3 },
  ac: { aaa: 7, aab: 8, aac: 9 },
  ba: { aaa: 10, aab: 11, aac: 12 },
  bc: { aaa: 16, aab: 17, aac: 18 } } 

Play with it. Have fun with it. I am pretty sure, you will find what you want from it. Good luck.

Full Test Script

const {ObjectMatchMaker, omm} = require('./index');

let a = {
   aa: {
       aaa: 1,
       aab: 2,
       aac: 3
   },
   ab: {
       aaa: 4,
       aab: 5,
       aac: 6
   },
   ac: {
       aaa: 7,
       aab: 8,
       aac: 9
   },
}
let b = {
   ba: {
       aaa: 10,
       aab: 11,
       aac: 12
   },
   ab: {
       aaa: 13,
       aab: 14,
       aac: 15
   },
   bc: {
       aaa: 16,
       aab: 17,
       aac: 18
   },
}


let test_51 =[ [a, b], 0,0, 1, ['aaa', 'aac']]
let test_1 =[ [a, b]]
let test_2 =[ [a, b], 0]
let test_3 =[ [a, b], 1]
let test_4 =[ [a, b], 1,1]
let test_5 =[ [a, b], 0,0]
let test_6 =[ [a, b], 1,0, 0]
let test_7 =[ [a, b], 1,0, 1]
let test_8 =[ [a, b], 1,0, 1, ['aaa', 'aac']]

let object = {
   test_1, test_2, test_3, test_4, test_5, test_6, test_7, test_8, test_51
}



let arg = process.argv.slice(2)[0]

if(!arg){
   arg = 'test_51'
   console.log('you must include test detail from test_1 to test_8. Do not forget the underscores. Therefore, I am outputting a test file but it is not the exact one you are looking for')
}

ObjectMatchMaker(...object[arg]).then(res => {
   console.log(res, ' from ', arg)

})

Change Log

2.1.3

• Added bullet list for readability

2.1.2

• include change log
• update README.md, fix some grammar.