I want get last value in checkboxgroup. I try using cmp.find("mygroup").get("v.value") but it get all value.


If I understand correctly, you want to get last selected value of array of all selected checkboxes

var selectedValues = cmp.find("mygroup").get("v.value");
if(selectedValues.length != 0){
    var lastSelectedValue = selectedValues[selectedValues.length - 1]; //  desired result

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