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JavaScript

Array.prototype.count_unique = function() {
    var arr2 = [];
    for (i = this.length; i--;) {
        if (arr2.indexOf( this[i] ) == -1) arr2.push( this[i] );
    }
    return arr2.length;
}

var r = ['car', 'car', 'bike', 'bike', 'truck']
console.log(r.count_unique())

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JSFiddle - React, Tailwind, and code Playground

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