Compare 2 array and change the property value

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there are 2 array refArr and finalArr. I need to change the value of "external" in finalArr based on the refArr. if the value of "external" is true in refArr then the value of "external" should change true in finalArr or if the "external" is false in refArr it should change to false in finalArr. In the finalArr if the value of "Editable" is false that object is untouched.

let refArr = [
    {number: "8088",external: true,Editable: true, type: "Abcd"},
    {number: "8089",external: true,Editable: true,  type: "efg"},
    {number: "8080",external: false,Editable: true,  type: "hij"}
]

let finalArr = [
    {number: "6543",external: false,Editable: false, type: "xyz"},
    {number: "8089",external: false,Editable: true, type: "efg"},
    {number: "8080",external: true,Editable: true, type: "hij"},
    {number: "8088",external: false,Editable: true, type: "Abcd"},
    {number: "8088",external: false,Editable: true, type: "Abcd"}
]

this is the final output in need 

finalArr = [
    {number: "6543",external: false,Editable: false, type: "xyz"},
    {number: "8089",external: true,Editable: true, type: "efg"},
    {number: "8080",external: false,Editable: true, type: "hij"},
    {number: "8088",external: true,Editable: true, type: "Abcd"},
    {number: "8088",external: true,Editable: true, type: "Abcd"}
]

I am not able to get the logic to change the value in finalArr base on the refArr.


If you didn't want to mutate the original finalArr:

const tmp = finalArr.map( x => {
  const match = refArr.find( y => y.number === x.number);

  if ((x.Editable && match) && x.external !== match.external) {
      x.external = match.external;
    }

  return x;
});

If you don't care if finalArr is mutated:

finalArr.forEach( x => {
  const match = refArr.find( y => y.number === x.number);

  if ((x.Editable && match) && x.external !== match.external) {
      x.external = match.external;
  }  
});

How can I compare two arrays of objects and change a value for , Try this : array2.map(function(x){ var result=array1.filter(a1=> a1.id==x.id); if(​result.length>0) { x.name=result[0].name;} return x }). Compare two array values but different way.. Comparing two different values column values for matching records. Comparing two column values from 2 different excels.


Or this old school nested loop ...

let refArr = [
    {number: "8088",external: true,Editable: true, type: "Abcd"},
    {number: "8089",external: true,Editable: true,  type: "efg"},
    {number: "8080",external: false,Editable: true,  type: "hij"}
]

let finalArr = [
    {number: "6543",external: false,Editable: false, type: "xyz"},
    {number: "8089",external: false,Editable: true, type: "efg"},
    {number: "8080",external: true,Editable: true, type: "hij"},
    {number: "8088",external: false,Editable: true, type: "Abcd"},
    {number: "8088",external: false,Editable: true, type: "Abcd"}
]

for(let i = 0; i < finalArr.length; i++) {
    for(let j = 0; j < refArr.length; j++) {
        if(finalArr[i].number === refArr[j].number) {
            finalArr[i].external = refArr[j].external
        }
    }
}
console.log(finalArr)

Check if two arrays or objects are equal with JavaScript, To properly compare two arrays or objects, we need to check: We'll accept two arguments: the value is one array or object, and other is the other array Compare properties var match; if (type === '[object Array]') { for (var i = 0; If the item is a function, we need to convert it to a string using the toString()  Use a hash to track values as you iterate. This example simply returns true or false, but you could also scan the entire array and return the repeated values. function uniquifyArray(ary) { var seen = {}; var isUnique = true; /* iterate backwards since the array length will change as


Does not mutate the original and does not reference objects in the original array.

Using Array#map, Array#find, destructuring, and spread syntax.

const ref=[{number:"8088",external:!0,Editable:!0,type:"Abcd"},{number:"8089",external:!0,Editable:!0,type:"efg"},{number:"8080",external:!1,Editable:!0,type:"hij"}]
const data=[{number:"6543",external:!1,Editable:!1,type:"xyz"},{number:"8089",external:!1,Editable:!0,type:"efg"},{number:"8080",external:!0,Editable:!0,type:"hij"},{number:"8088",external:!1,Editable:!0,type:"Abcd"},{number:"8088",external:!1,Editable:!0,type:"Abcd"}];

const res = data.map(({external, ...o})=>{
   const r = ref.find(({number})=>number===o.number);
   if(r && r.Editable){
      return {...o, external: r.external}
   }
   return {...o, external}
});

console.log(res);

Comparing two arrays to see if they contain objects with different IDs , It runs through every value of the array ( x in my code), letting you know the current index ( i in my code), and This new version does compare id properties. Step 1: We need to declare the function with two parameters. function compare(arr1,arr2){} Step 2: We need to Initialize an empty array. function compare(arr1,arr2){const finalarray =[];} Step 3: We are taking the help of forEach method in Array.protoype.forEach().


let refArr = [
    {number: "8088",external: true,Editable: true, type: "Abcd"},
    {number: "8089",external: true,Editable: true,  type: "efg"},
    {number: "8080",external: false,Editable: true,  type: "hij"}
]

let finalArr = [
    {number: "6543",external: false,Editable: false, type: "xyz"},
    {number: "8089",external: false,Editable: true, type: "efg"},
    {number: "8080",external: true,Editable: true, type: "hij"},
    {number: "8088",external: false,Editable: true, type: "Abcd"},
    {number: "8088",external: false,Editable: true, type: "Abcd"}
]

finalArr.forEach(x => {
    if(!x.Editable) return;
    const ref = refArr.find(y => y.number === x.number);
    if(!ref) return;
    
    if(ref.external === true) x.external = !x.external;
})

console.log(finalArr)

How to compare two arrays in JavaScript?, In Javascript, to compare two arrays we need to check that the length of both arrays should be same, JavaScript provides a function JSON.stringify() in order to convert an object or array into JSON string. comapring each element of array​. You can see below that the Compare-Object cmdlet allows you to compare both arrays at once. If the SideIndicator property is =>, this means the InputObject property returned is in the DifferenceObject value and not in the ReferenceObject value and vice versa for the <= SideIndicator. By default, Compare-Object returns differences.


let refArr = [
    {number: "8088",external: true,Editable: true, type: "Abcd"},
    {number: "8089",external: true,Editable: true,  type: "efg"},
    {number: "8080",external: false,Editable: true,  type: "hij"}
]

let finalArr = [
    {number: "6543",external: false,Editable: false, type: "xyz"},
    {number: "8089",external: false,Editable: true, type: "efg"},
    {number: "8080",external: true,Editable: true, type: "hij"},
    {number: "8088",external: false,Editable: true, type: "Abcd"},
    {number: "8088",external: false,Editable: true, type: "Abcd"}
]

let result = finalArr.map((f) => {
    if (f.Editable) {
        const ref = refArr.find(r => r.number == f.number);
        f.external = ref.external;
    }

    return f;
});

console.log(result);

How to find if two arrays contain any common item in Javascript , Given two arrays containing array elements and the task is to check if two arrays Compare the element of each and. // every element from both of the. // arrays If it doesn't exist then assign properties === elements in the array. JavaScript | Remove the last item from an array · How to replace an item from an array in  Compare Two Array's for Existing values. Hi, I'm trying to make a Formula that compares values in Array1 (let's just say ColumnA) to values in Array2 (ColumnB), so as to determine if a Value exists in ColumnA that does not exist in ColumnB.


How to Compare 2 Objects in JavaScript, One quick way to compare if 2 objects have the same key value, is using ES6 Way for comparing 2 objects; JSON.stringify vs Lodash's isEqual Performance If you have small arrays it's okay but for my personal use cases with more than  The compare function compares all the values in the array, two values at a time (a, b). When comparing 40 and 100, the sort() method calls the compare function(40, 100). The function calculates 40 - 100 (a - b), and since the result is negative (-60), the sort function will sort 40 as a value lower than 100.


JavaScript Array sort: Sorting an Array More Effectively, Besides returning the sorted array, the sort() method changes the positions of the elements sorts the array elements in ascending order with the smallest value first and largest value last. The compare function of the sort() method accepts two arguments and returns a Sorting an array of objects by a specified property​. In this program we will read two one dimensional arrays of 5 elements and compare them. Here are the functions which we designed to read, print and compare arrays. readArray() printArray() compareArray() readArray() will read array of 5 elements. printArray() will print array of 5 elements.


Data Structures: Objects and Arrays :: Eloquent JavaScript, This will replace the property's value if it already existed or create a new With objects, there is a difference between having two references to the same object  Examples. The following example declares a class named Example with one static (Shared in Visual Basic) and one instance property. The example uses the SetValue(Object, Object) method to change the original property values and displays the original and final values.