Can I achieve this in a single line using coffeescript?
obj = {}
obj[key] = value
I attempted the following:
obj = { "#{key}": value }
Unfortunately, it was not successful.
Can I achieve this in a single line using coffeescript?
obj = {}
obj[key] = value
I attempted the following:
obj = { "#{key}": value }
Unfortunately, it was not successful.
The feature was taken out of the language
Apologies for the delay -- my recollection is that it was removed because certain language functionalities rely on knowing the key at compile time, like method overrides and super calls within class bodies. Having the key known allows for a proper construction of a super call.
Additionally, using dynamic keys meant having to wrap objects in closures when used as expressions, which was common.
Moreover, JavaScript already offers a clear syntax for dynamic keys:
obj[key] = value.There's something elegant about limiting the
{key: value, key: value}format to "pure" identifiers as keys.
Let x be an empty object;
x[key] = value;
Once compiled, it will transform to:
var x;
(x = {})[key] = value;
This snippet of code is standard JavaScript. Using CoffeeScript eliminates the need to explicitly declare variables with var.
For those who come across this question in the future, it is worth noting that starting from CoffeeScript version 1.9.1, interpolated object literal keys are once again supported!
The new syntax appears as follows:
myObject =
a: 1
"#{ 1 + 2 }": 3
Further information can be found at https://github.com/jashkenas/coffeescript/commit/76c076db555c9ac7c325c3b285cd74644a9bf0d2.
If your key is not too complicated, you can simply use the key as a variable name to define an object. Here's how:
myKey = "Some Value"
obj = {myKey}
This code will translate to:
var myKey, obj;
myKey = "Some Value";
obj = {
myKey: myKey
};
This approach gets you pretty close to what you want, but remember that your keys need to be valid variable names.
In the event that you are utilizing underscore, there is an option to employ the _.object function, which essentially operates as the opposite of the _.pairs function.
_.pairs({x: 7, y: 'world'})
//=> [['x', 7], ['y', 'world']]
_.object([['x', 7], ['y', 'world']])
//=> {x: 7, y: 'world'}
Hence, in a scenario where myKey = 'uniquekey' and myValue = 500, one can utilize:
var obj = _.object([[myKey, myValue]]);
//=> obj = {uniquekey: 500}
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