对于一个序列,什么是Python'枚举'的ES6等价物？

Python有一个内置函数enumerate,可以获得一(index, item)对可迭代的对.

ES6是否具有数组的等价物？它是什么？

def elements_with_index(elements):
    modified_elements = []
    for i, element in enumerate(elements):
         modified_elements.append("%d:%s" % (i, element))
    return modified_elements

print(elements_with_index(["a","b"]))
#['0:a', '1:b']

function elements_with_index(elements){
     return elements.map(element => elements.indexOf(element) + ':' + element);
 }

console.log(elements_with_index(['a','b']))
//[ '0:a', '1:b' ]

let array = [1, 3, 5];
for (let [index, value] of array.entries()) 
     console.log(index + '=' + value);

['a','b'].map(function(element, index) { return index + ':' + element; });
//=> ["0:a", "1:b"]

['a','b'].map((e,i) => `${i}:${e}`)
//=> ["0:a", "1:b"]