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eg:
So:
foo = "asdf" {foo: "bar"} eval foo # how do I get {"asdf": "bar"} ? # this will throw parse error: {(eval foo): "bar"} This is a simple syntax question: how do I get CoffeeScript to construct a hash dynamically, rather than doing it by hand?
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Use bracket notation to get an object's value by a variable key, e.g. obj[myVar] . The variable or expression in the brackets gets evaluated, so if a key with the computed name exists, you will get the corresponding value back. Copied!
To get value in an object's key using a variable referencing that key with JavaScript, we can use square brackets. console. log(obj[name]); to get the name property of the obj object with obj[name] .
In JavaScript, before using a variable, we need to declare and initialize it (assign value). Unlike JavaScript, while creating a variable in CoffeeScript, there is no need to declare it using the var keyword. We simply create a variable just by assigning a value to a literal as shown below.
For anyone that finds this question in the future, as of CoffeeScript 1.9.1 interpolated object literal keys are supported!
The syntax looks like this:
myObject = a: 1 "#{ 1 + 2 }": 3 See https://github.com/jashkenas/coffeescript/commit/76c076db555c9ac7c325c3b285cd74644a9bf0d2
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