Preparation code

<script>
var arr = [],
    hash = {};

for (var i = 0; arr.length < 1000; i++) {
    var t = Math.floor(Math.random() * 5000);

    if (!hash[t]) {
        hash[t] = 1;
        arr.push(1);
    }
}
console.log(arr, hash);
</script>

Test runner

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var a = Math.floor(Math.random() * 5000),
    x = arr.indexOf(a);

var b = Math.floor(Math.random() * 5000),
    y = hash[b];

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