Javascript ajax call async:false

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Javascript

Ajax

jQuery

I have this AJAX call that receives data from the server. The only solution I've found is to make async: false to get the data outside the function. But it is deprecated. Is there any better option to get the variable out the function? Any suggestion would be appreciated.

var suggest =[];
    $.ajax({
        type: "POST",
        url: //LINK,
        async: false,
        data: {
            "dataA": string
        },
        cache: false,
        success: function(data) {
            suggest = JSON.parse(data);
        }
    });

What I have tried:

I am using the variable i'm getting from the AJAX call many times is there any better way to do call the data from the success function outside?

for (var i = suggest.length - 1; i >= 0; i--) {

       for (var j = 0; j < arrString.length; j++) {
           if (suggest[i] === arrString[j]) {
               suggest.splice(i, 1);
           }
       }
   }