JavaScript. How to Compare Input Arrays

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I'm stuck with this problem for 3 days now... Someone please help me.

Challenge 5 Construct a function intersection that compares input arrays and returns a new array with elements found in all of the inputs.

function intersection(arrayOfArrays) {

}

console.log(intersection([[5, 10, 15, 20], [15, 88, 1, 5, 7], [1, 10, 15, 5, 20]]));

// should log: [5, 15]

You could reduce the array by filtering with just checking if the other array contains the value.

This works for arrays with unique values.

Array#reduce:

If no initialValue is provided, then accumulator will be equal to the first value in the array, and currentValue will be equal to the second.

The callback

a.filter(v => b.includes(v))

filters array a. If the array b includes the value of a, then this value v is included in the accumulator for the next iteration or as final result.

     accumulator            currentValue           new accumulator
          a                       b                    result
--------------------    --------------------    --------------------
[     5, 10, 15, 20]    [15, 88,  1,  5,  7]    [             5, 15]
[             5, 15]    [ 1, 10, 15,  5, 20]    [             5, 15]

function intersection(arrayOfArrays) {
    return arrayOfArrays.reduce((a, b) => a.filter(v => b.includes(v)));
}

console.log(intersection([[5, 10, 15, 20], [15, 88, 1, 5, 7], [1, 10, 15, 5, 20]]));

Check if two arrays or objects are equal with JavaScript, To properly compare two arrays or objects, we need to check: That they're the same object type (array vs. object). That they have the same number of items. That each item is equal to its counterpart in the other array or object. That they're the same object type (array vs. object vs. string vs. number vs. function). By doing this we can conclude both arrays are the same or not. JavaScript provides a function JSON.stringify() in order to convert an object or array into JSON string. By converting into JSON string we can directly check if the strings are equal or not. Example #1: <script>. var a = [1, 2, 3, 5]; var b = [1, 2, 3, 5];


Reduce the arrays to a Map of counts, with the value as key. Spread the Map to entries. Use Array.filter() on the Map's entries to remove all entries, which value is not equal to the arrayOfArrays lenth. Extract the original number from the entries using Array.map():

function intersection(arrayOfArrays) {
  return [...arrayOfArrays.reduce((r, s) => {
    s.forEach((n) => r.set(n, (r.get(n) || 0) + 1));
    
    return r;
  }, new Map())]
  .filter(([k, v]) => v === arrayOfArrays.length)
  .map(([k]) => k);
}

console.log(intersection([[5, 10, 15, 20], [15, 88, 1, 5, 7], [1, 10, 15, 5, 20]]));

How to compare two arrays in JavaScript?, How to pass an array as a function parameter in JavaScript ? Introduction to JavaScript · How to force Input field to enter numbers only using JavaScript ? In Javascript, to compare two arrays we need to check that the length of both arrays​  Comparison of Two arrays Using JavaScript Step 1: We need to declare the function with two parameters. Step 2: We need to Initialize an empty array. Step 3: We are taking the help of forEach method in Array.protoype.forEach (). Step 4: Returning the final Answer.


First try to find out the intersection of two arrays which is the base problem. Then try to build up for variable number of arrays passed as arguments for intersection. You can use reduce() for doing that.

function intersectionOfTwoArrays(arr1, arr2)
{
   return arr1.filter(x => arr2.some(y => y === x)); 
}


function intersection(...arrayOfArrays)
{
	return arrayOfArrays
	       .reduce((a, b) => intersectionOfTwoArrays(a, b));
}

intersection(
[5, 10, 15, 20], 
[15, 88, 1, 5, 7], 
[1, 10, 15, 5, 20]
);

How to compare two JavaScript array objects using jQuery , How to convert an Object {} to an Array [] of key-value pairs in JavaScript? ES6 | Classes · How to force Input field to enter numbers only using JavaScript ? Given two JavaScript array/array objects and the task is to compare the equality of  Or if you want to check jquery version of this here is the fiddle link. Now once you know, if there is any difference element or not, you would have to loop through each element of both arrays to get unique data using javascript. Suppose you need to get a Unique data of array one from array2 for it code will be.


You can go through the first array in the array of arrays and check which of its value is present in all the other arrays.

Here is an example:

function intersection(input) {
    let firstArray = input[0];
    let restOfArrays = input.splice(1);
    return firstArray.filter(v => restOfArrays.every(arr => arr.includes(v)));    
}

const input = [[5, 10, 15, 20], [15, 88, 1, 5, 7], [1, 10, 15, 5, 20]];
const result = intersection(input);

console.log(result);

JavaScript Array Reference, Well organized and easy to understand Web building tutorials with lots of examples of how to use HTML, CSS, JavaScript, SQL, PHP, Python, Bootstrap, Java  To properly compare two arrays or objects, we need to check: That they’re the same object type (array vs. object). That they have the same number of items. That each item is equal to its counterpart in the other array or object. That they’re the same object type (array vs. object vs. string vs. number vs. function). That they have the same value.


Works with even if there is duplicate in same array.. like in my example added 5 twice in arrayEle[1];

var arrayEle = [[5, 10, 15, 20], [15, 88, 1, 5, 5], [1, 10, 15, 5, 20]]
var startIndex = 1;
var newArray = [];
for (var x = 0; x < arrayEle[0].length; x++) {
  var temVal = 1;
  var value;
  for (var y = 1; y < arrayEle.length; y++) {
    for (var z = 0; z < arrayEle[y].length; z++) {
      if (arrayEle[y][z] == arrayEle[0][x]) {
        temVal++;
        value = arrayEle[y][z];
        break;
      }
    }
  }
  if (temVal == arrayEle.length) {
    newArray.push(value);
    console.log(value);
  }
}
console.log(newArray);


//log: [5, 15]

compare two arrays Code Example, “compare two arrays” Code Answer. You may not remember next time either, so install Grepper. compare two arrays. javascript by Grepper on Jul  Arrays are a special type of objects. The typeof operator in JavaScript returns "object" for arrays. But, JavaScript arrays are best described as arrays. Arrays use numbers to access its "elements". In this example, person[0] returns John:


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