JavaScript 中类似 Python 的解包
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Python-like unpacking in JavaScript
提问by Kit
I have the following string
我有以下字符串
output_string = "[10, 10, [1,2,3,4,5], [10,20,30,40,50]]"
Then I JSON.parseit
那我JSON.parse它
my_args = JSON.parse(output_string)
How do I unpack it in a Python-like way so that every element in my_argsbecomes an argument to a JavaScript function?
我如何以类似 Python 的方式解压缩它，以便中的每个元素都my_args成为 JavaScript 函数的参数？
some_javascript_function(*my_args)
// should be equivalent to:
some_javascript_function(my_args[0],my_args[1],my_args[2],my_args[3])
// or:
some_javascript_function(10, 10, [1,2,3,4,5], [10,20,30,40,50])
Is there a core JavaScript idiom that does that?
是否有一个核心的 JavaScript 习语可以做到这一点？
回答by fbuchinger
Once you 've collected the function arguments in an array, you can use the apply()method of the function object to invoke your predefined function with it:
一旦你在一个数组中收集了函数参数，你就可以使用apply()函数对象的方法来调用你预定义的函数：
some_javascript_function.apply(this, my_args)
The first parameter (this) sets the context of the invoked function.
第一个参数 ( this) 设置调用函数的上下文。
回答by ifedapo olarewaju
You can achieve that by doing this
some_javascript_function(...my_args)
你可以通过这样做来实现
some_javascript_function(...my_args)
This is called spreadoperation (as unpackingis in python).
view docs here https://developer.mozilla.org/en/docs/Web/JavaScript/Reference/Operators/Spread_operator
这称为spread操作（就像unpacking在 python 中一样）。在此处查看文档https://developer.mozilla.org/en/docs/Web/JavaScript/Reference/Operators/Spread_operator
回答by joshuakcockrell
Unpack using "..."
使用“...”解包
The same way you accept unlimited args, you can unpack them.
与接受无限参数的方式相同，您可以解压缩它们。
let vals = [1, 2, 'a', 'b'];
console.log(vals); // [1, 2, "a", "b"]
console.log(...vals); // 1 2 "a" "b"
Example: Accept unlimited arguments into a function
示例：在函数中接受无限参数
It will become an array
它会变成一个数组
const someFunc = (...args) => {
console.log(args); // [1, 2, "a", "b"]
console.log(args[0]); // 1
console.log(...args); // 1 2 "a" "b"
}
someFunc(1, 2, 'a', 'b');
Example: Send array of arguments into a function
示例：将参数数组发送到函数中
const someFunc = (num1, num2, letter1, letter2) => {
console.log(num1); // 1
console.log(letter1); // "a"
}
let vals = [1, 2, 'a', 'b'];
someFunc(...vals);
Send arguments
发送参数
