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I was running some tests on javascript and I realized that when I use the function delete in an index of a array, the array is still the same size.
Example:
a = [1, 2, 3]
delete a[1]
console.log(a.length); // Imprime 3
Why does this happen?
7
The delete only arrow the index value passed from the array to undefined.
delete a[1];
console.log(a); //[1,undefined,3]
To remove an index from the array you can use the Array.splice
a.splice(1,1); //vai retornar o indice removido [2]
console.log(a); //[1,3]
How interesting, even if the deleted element is the last the size remains 3! While in the assignment the length is updated (eg.: a[10] = 4 does the length become 11). This is another Javascript weirdo I didn’t know...
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The
deleteonly removes the assigned value. It is a question of data structure. Aarrayis a limited and fixed sequence of memory lained positions. If you want to manipulate a list you must use a chained list, not natively present in Javascript.– MFedatto