Question

javascript是否等效于Python的operator.add或任何其他二进制运算符？

在Python中：

from operator import add
from functools import reduce

# prints 15, requires defining the addition operator
print(reduce(lambda a, b: a + b, [1, 2, 3, 4, 5]))

# prints 15, does not require defining the addition operator
print(reduce(add, [1, 2, 3, 4, 5]))

在Java语言中：

// prints 15, requires defining the addition operator
console.log([1, 2, 3, 4, 5].reduce((a,b) => a + b))

// is there a way to do this without defining the addition operator?
console.log([1, 2, 3, 4, 5].reduce(???)

Answer 1

您执行此操作的方式是我在JavaScript中意识到的最简洁的方式。您可能需要为[ 'label'=> 'Child', 'value' => function($data){ return $data->order->kids; } ],提供默认值，以防止输入数组为空：

reduce

Answer 2

Javascript是一种低级语言：除非您定义它，否则是不可能的。

请参见Array.prototype.reduce

const add = (acc, item) => {
    return acc = acc + item;
});

console.log([1, 2, 3, 4, 5].reduce(add, 0));

相当于Python的operator.add的Javascript

2 个答案: