This content originally appeared on DEV Community and was authored by Shuvo
In case of string we can simply use == or === to see if they are same but we can't use those to see in two arrays are similar or in other words they have same elements.
So this wont work.
const array1 = [1, 2, 3, 4, 5]
const array2 = [1, 2, 3, 4, 5]
console.log(array1 == array2) //false
But what if we convert our array to string? Then you can use the comparison operator. This makes the task very easy. We can sort an array using toString method eg. array1.toString() or we can use this hack
console.log([1, 2, 3, 4, 5] + "")
//logs 1,2,3,4,5
console.log(typeof ([1, 2, 3, 4, 5] + ""))
//logs string
So basically if we try to concatenate string(empty string in this case) to an array the array will be converted to a string.
so now we can simply use the arrays as strings and compare them
const array1 = [1, 2, 3, 4, 5]
const array2 = [1, 2, 3, 4, 5]
console.log(array1 + "" == array2 + "") //true
Also if you want it to work with arrays where the elements are not in order you can first sort them. Let's create a utility function for that
function compareArr(arr1, arr2){
arr1.sort()
arr2.sort()
return arr1 + "" == arr2 + ""
}
const array1 = [1, 2, 3, 4, 5]
const array2 = [1, 5, 2, 4, 3]
console.log(compareArr(array1, array2)) // returns true
This content originally appeared on DEV Community and was authored by Shuvo
Shuvo | Sciencx (2021-10-18T04:12:10+00:00) Simplest way to compare two array in JS. Retrieved from https://www.scien.cx/2021/10/18/simplest-way-to-compare-two-array-in-js/
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