Without indexOf

HTML

<script>
    
    var _consoleLog = console.log;
    
    console.log = function(){
        var name = _consoleLog.apply(console,arguments);
        var str = "";
        for(var index in arguments){
            str += arguments[index]+" ";
        }
        $('body').append(str);
    }
   
</script>

JavaScript

var arr = [{a:'apple'},{a:'orange'},{a:'pear'}];

console.log("found:", arr.indexOf(arr.a == "orange"));