.splice doesn´t delete (solved)

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EDIT: my mistake. I typed slice instead of splice. Forget I wrote this.

Need to delete elements from an array of objects. But after .splice(index,1), the array stays unchanged. The splice itself works OK: it returns exactly the element which should be deleted.

I remarked-out the
numItemsCounter --;
(which should be there), because if not, the loop is eternal (because the element is never deleted).

Must be doing something wrong, but I have looked everywhere, can´t find it.

BTW, the objMap (the array of objects) is handed down from another function.

Here the code:

function fnKillThisUnitFromArray(objMap, strUnitId) {
 let numItemsCounter;
 for (numItemsCounter = 0; numItemsCounter < objMap.items.length; numItemsCounter++) {
 if (objMap.items[numItemsCounter].UnitId === strUnitId) {
 var objDummy = objMap.items.slice(numItemsCounter, 1);
            console.log("Deleted from objmap;" + JSON.stringify(objDummy));
            console.log("objMap after 1 kill " + strUnitId + "=" + JSON.stringify(objMap));
//          numItemsCounter --;
        }

   }
    console.log("objMap after all kills " + strUnitId + "=" + JSON.stringify(objMap));
}

Anyone?