Is it possible to use a string as the key in a JavaScript object?
var func,
object;
func = function () {
return "foo";
};
// It is valid
object = {
'foo': 'bar'
};
// This will not work
object = {
method(): 'bar'
};
Is it possible to use a string as the key in a JavaScript object?
var func,
object;
func = function () {
return "foo";
};
// It is valid
object = {
'foo': 'bar'
};
// This will not work
object = {
method(): 'bar'
};
One way to access values in JavaScript is by using square bracket syntax. However, this method cannot be used when declaring an object literal. Instead, you can achieve the same result by following a different approach.
obj = {};
obj[method()] = "bar";
Start by initializing an empty object, and then use the method as a key in order to set it up the way you desire.
var myMethod = function() {
return 'foo';
};
var myObject = {};
myObject[myMethod()] = 'foo';
That's not the right approach.
You have the ability to accomplish this task in a different way:
function performTask() {
return "baz";
};
var object = {}
;
object[performTask()] = 'qux';
When it comes to functions and indexing...
Although it may seem like it will work, it is not advisable and it does not function as expected:
var object = {}
;
object[performTask] = 'qux';
What actually occurs is that performTask will be converted into a string using performTask.toString() and the outcome might not always match what you anticipate.
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