JavaScript 中是否有等效的 Python 自文档表达式？

Question

in Python 3.8 it is possible to use self-documenting expressions in f-strings like this:

>>> variable=5
>>> print(f'{variable=}')
variable=5

is there an equivalent feature in JavaScript?

Answer 1

The only reasonable way to do something like this would be for properties of objects:

 const logObj = (obj) => { for (const [key, val] of Object.entries(obj)) { console.log(key, val); } }; const obj = { foo: 'fooval', bar: 'barval', }; logObj(obj);

There's no good way to do this for standalone variables. But the execution logic of a script should not (and, indeed, almost always does not) depend on the names of the variables used in the script - that would break minification and would be confusing to other readers of the script. Even if it might be theoretically possible to do something like

logVar(someVar)

and have the string someVar be logged (such as by throwing an error and examining the source text), that would be an extraordinary strange thing to do.

Answer 2

You can self-assign a variable into an object and stringify it:

 let variable = 5; console.log(JSON.stringify({variable}));