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<p>An object method is a function definition stored as a property value.</p>
<p>If you access it without (), it will return the function definition:</p>
<p id="demo"></p>
<script>
var person = {
firstName: "John",
lastName : "Doe",
id : 5566,
fullName : function() {
return this.firstName + " " + this.lastName;
}
};
document.getElementById("demo").innerHTML = person.fullName;
</script>
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