JavaScript Array length Comparison

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In my code I check if there is similar values in two arrays and if there are similar values they wont be displayed in my result, however if I do the same check but switch the arrays length, which means Array2 is longer than Array1 , I got an empty result, empty array. How can I get the same result even after switching the lenght of the arrays?

My code :

    var Array2 = [ "1", "2", "3", "4", "5" ]; 
    var Array1 = ["1","2","3"];
      
    var result = [];
      
    
    for(var i = 0; i < Array1.length ; i++){
        
        var x = Array1[i];
        var check = false;        
      
        for( var y = 0; y < Array2.length; y++){
          
          if(x == Array2[y]){
           
            check = true;
          }
        }
        if(!check){
          result.push(x);
        }
    }
    console.log(result);

You can use ES6 .filter() method to remove duplicates from arrays.

ES6 Approach:


let Array2 = [ "1", "2", "3", "4", "5" ]; 
let Array1 = ["1","2","3"];

let result = Array2.filter(val => !Array1.includes(val));

console.log(result);

Array.length, 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  Yesterday, we looked at a way to tell if two arrays are equal with JavaScript. The approach is fast and simple, but falls apart pretty quickly for all but the most basic of arrays. Today, we’re going to look at a much more robust way to compare two arrays (or objects) and check if they’re equal to each other. What we need to compare You could have a simple array, like this one.

Try following

var Array2 = [ "1", "2", "3", "4", "5" ]; 
var Array1 = ["1","2","3"];

var result = [...Array1.filter(v => !Array2.includes(v)), ...Array2.filter(v => !Array1.includes(v))];
console.log(result);

JavaScript Array length Comparison, length is a property of arrays in JavaScript that returns or sets the number of elements in a given array. The length property of an array can be returned like so. let  array .length = number. Technical Details. A Number, representing the number of elements in the array object. JavaScript Version: JavaScript Tutorial: JavaScript Arrays. JavaScript Array Reference. If you want to report an error, or if you want to make a suggestion, do not hesitate to send us an e-mail: support@w3schools.com.

Eloborate way

var Array2 = [ "1", "2", "3", "4", "5" ]; 
var Array1 = ["1","2","3"];
var result = [];
var matches = false;

if(Array2.length >= Array1.length){
  getUnique(Array2,Array1);
}
else{
  getUnique(Array1,Array2);
}


function getUnique(maxArray,minArray){
  $.each(maxArray,function(n1,i1){
     matches = false;
     $.each(minArray,function(n2,i2){
           if(i1 === i2){
             matches = true;
            }          
      });
      if(!matches){
        result.push(i1);
      }
  });
}
console.log(result);

JavaScript Array length Property, To properly compare two arrays or objects, we need to check: That they're the You can easily get the value of an array using array.length . I'm making a simple higher or lower card game with javascript in which the user guesses if the next card will be higher or lower than the current card shown. I currently have an array of 52 cards & I'm using Math.random to randomly generate a card from the array. What I want is to compare the value of two cards but I'm not sure how to go about it.

Array Length, JavaScript - Array length Property - JavaScript array length property returns an unsigned, 32-bit integer that specifies the number of elements in an array. The length property of an object which is an instance of type Array sets or returns the number of elements in that array. The value is an unsigned, 32-bit integer that is always numerically greater than the highest index in the array.

Check if two arrays or objects are equal with JavaScript, Get code examples like "array length javascript" instantly right from your google compare and sort strings alphabetically · Javascript compare two arrays  With JavaScript version 1.6 it's as easy as this: Array.prototype.equals = function(array) { return this.length == array.length && this.every(function(this_i,i) { return this_i == array[i] }) } For example, [].equals([]) gives true, while [1,2,3].equals([1,3,2]) yields false.

JavaScript - Array length Property, We talk about what the JavaScript Array is, nested arrays and array comparison, Note that array[array.length] = value adds a new value to the end of array  JavaScript arrays are used to store multiple values in a single variable. An array is a special variable, which can hold more than one value at a time. If you have a list of items (a list of car names, for example), storing the cars in single variables could look like this: However, what if you want to loop through the cars and find a specific one?

Comments
  • Possible duplicate of How to compare arrays in JavaScript?
  • You can try lodash.com/docs/4.17.10#difference
  • Every element in the shorter array is found in the larger array, but not every element in the longer array is found in the shorter array. Your code is doing exactly what it's written to do.
  • I'm voting to close this question as off-topic because the code does exactly what you want it to do.
  • Your first example shows '4' and '5' if you print Array2 , but I want my result to be '4' and '5' not array 2.
  • One moment @IlonaSemyonov
  • @IlonaSemyonov Glad to help :)
  • Your first example works partially ,it prints the result as values '4' and '5' if Array2 is bigger than 1, but if you switch the arrays and Array 1 is bigger now than two it prints '4','5','4','5'
  • @IlonaSemyonov - The above answer does not worry about the length of the arrays. Can you please present the case where it did not working for you?