JavaScript move an item of an array to the front

You can sort the array and specify that the value "role" comes before all other values, and that all other values are equal:

var first = "role";
data.sort(function(x,y){ return x == first ? -1 : y == first ? 1 : 0; });

Demo: http://jsfiddle.net/Guffa/7ST24/

The cleanest solution in ES6 in my opinion:

let data = ["email","role","type","name"];
data = data.filter(item => item !== "role");
data.unshift("role");

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