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First of all you will have to pass index to deleteSubmit, as Vamsi Krishna commented
<a @click="deleteSubmit(arrest, index)" target="_blank">Delete Arestee</a></button>
Then you can bind the index in the callback:
deleteSubmit: function(arrest, index) {
...
success: function(index, arrest) {
if (arrest.status){
alert("Success")
arrest.splice(index, 1);
} else {
alert("Failed")
}
}.bind(null, index)
...
}
Source:stackexchange.com