Looking to implement two JavaScript arrays using AngularJS. My goal is to transfer elements from Ar1 to Ar2, and then have any changes made to the values in Ar2 automatically update the values in Ar1 as well.
Looking to implement two JavaScript arrays using AngularJS. My goal is to transfer elements from Ar1 to Ar2, and then have any changes made to the values in Ar2 automatically update the values in Ar1 as well.
It is not possible to establish a direct connection between the values stored in one array and those in another array. For instance:
var arr1 = [42];
var arr2 = [];
arr2.push(arr1[0]);
This scenario results in the following memory structure:
arr1does not have any inherent link to the 42 inarr2.An alternative approach would be to have both arrays reference objects and manipulate the properties of those shared objects, rather than manipulating individual entries within the arrays. By having both arrays refer to the same objects, any modifications made through one reference would also reflect in the other.
For example:
var arr1 = [{foo:"bar"}]; var arr2 = []; arr2.push(arr1[0]); console.log(arr1[0].foo); // "bar" arr2[0].foo = "updated"; console.log(arr1[0].foo); // "updated"In this case, the code:
var arr1 = [{foo:"bar"}]; var arr2 = []; arr2.push(arr1[0]);results in the following memory configuration:
+------------+ arr1-->| (array) | +------------+ | 0: ref5542 |----+ +------------+ | | +------------+ +------------+ +---->| (object) | arr2-->| (array) | | +------------+ +------------+ | | foo: "bar" | | 0: ref5542 |----+ +------------+ +------------+Both arrays point to the same object, allowing changes to that object's state to be reflected regardless of the referencing array used.
When you store reference type variables in an array, the same reference will be shared at each location.
var a1 = [{a:10,b:20}];
var a2 = [];
a2.push(a1[0]);
console.log(a1,a2) //shows {a:10,b:20}, {a:10,b:20}
a2[0].a = 30;
console.log(a1,a2) //displays {a:30,b:20}, {a:30,b:20}
This behavior is different when dealing with primitive types such as numbers, strings, booleans, etc.
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