Array and javascript - how to compare two arrays -


is there way value changed when comparing 2 arrays?

i'll explain better.

let's have

arr1 = [1,2,3] arr2 = [1,2,3]

arr2 created dynamically, , default same arr1

when change arr2 arr2 = [0,2,3] how can detect value changed? (in case, 1 changed 0)?

if want know value in index changed, , changed value, can use array#reduce create array of changes.

var arr1 = [1, 2, 3];  var arr2 = [0, 2, 3];    function whatchanged(arr1, arr2) {    return arr2.reduce(function(d, v, i) {      v !== arr1[i] && d.push({        index: i,        from: arr1[i],        to: v      });        return d;    }, []);  }    var diff = whatchanged(arr1, arr2);      console.log(diff);


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