My approach so far has been the following:
try {
var obj = {"name":"n","name":"v"};
console.log(obj); // outputs { name: 'v' }
} catch (e) {
console.log(e); // no exceptions printed
}
My goal is to detect duplicate keys within a large static Javascript object using conventional tools.
It's not about removing keys, but rather overwriting them. Keys in objects must be unique, so only the last assignment will be retained.
One solution could be to encapsulate those elements within an array:
{
"names":[
{"name":"n"},
{"name":"v"}
]
}
When strict mode is enabled in JavaScript, an exception will be thrown if you attempt to define an object literal with duplicate keys;
"use strict";
try {
var obj = {"name":"n","name":"v"};
console.log(obj);
} catch (e) {
console.log(e);
}
UPDATE: This feature is only applicable in ECMAScript 5 and not in ECMAScript 6 as mentioned in "Understanding ECMAScript 6." I have yet to experiment with it.
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