My team was assigned a project by another team, and while working on it, I noticed something peculiar. Initially, they declared a variable as an array:
private myvariable: Array<any> = [];
However, in the actual code, they were using it as an object, performing actions like this:
myvariable['key'] = { 'prop': 'val' }
This resulted in an unexpected outcome:
[key: {...}]
Can anyone provide insight into how to interpret this data structure?
Within the realm of programming, an Array is essentially a JavaScript Object that has the ability to possess properties and methods akin to those found in a "pure" object. The distinction lies in how an Array behaves when certain methods like .toString() or the process of conversion via JSON.stringify() are applied. Notably, its properties will not be included in the JSON representation.
To gain insight into its properties, one can visualize them by transforming (via Object.assign()) the Array into an object as demonstrated below:
var array=[1,2,3];
array.key='hello';
console.log(JSON.stringify(Object.assign({},array)));
// {"0":1,"1":2,"2":3,"key":"hello"}
Through this approach, the Array will be displayed as an object, with index numbers appearing as string property names alongside their corresponding values.
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