I have an array in Javascript. It looks like the one below.
source_array=[["A","B","C"],["A","B","C"],["A","B","C"]];
I create it by source_array.push(anotherArray).
During the running of my code i remove entries from the indexes one by one by
source_array[1].splice(0,1). So from [["A","B","C"],["A","B","C"],["A","B","C"]] i expect to get [["A","B","C"],["B","C"],["A","B","C"]];
If i do it enough times i should end up with [["A","B","C"],[],["A","B","C"]].
How to properly check if source_array[1] is now empty? It doesnt seem to work for me.
If (source_array[1] == undefined) this turns out FALSE instead of TRUE. It gives out FALSE only after i am done removing the items. It works well if i check for source_array[2] in a source_array[["A","B","C"],["A","B","C"]]
I think i tried everything i found online.
I feel it will be something basic, but i am an amateour and this...beats me.
While the array is empty, it's not undefined.
Always check the array's length property to determine whether a targeted array is empty.
Thus:
let arr = [];
let arr2 = ['foo', 'bar'];
arr.length === 0; // true, empty
arr2.length === 0; // false, populated