Which objects can be traversed by for of

Which objects can be traversed by for of

for...of...: It is a new traversal method in es6, but it is limited to iterators (iterator), so ordinary objects will report errors when using for...of to traverse.

Iterable objects: including Array, Map (mapping), Set (collection), String, TypedArray, arguments object, etc.

The syntax of the JS for of loop is as follows:

for (variable of iterable) {
    // 要执行的代码
}

Among them, variable is a variable, and this variable will be assigned a different value each time it is looped. We can use this variable in the following { } to perform a series of operations; iterable is the content to be traversed. In each loop, Will assign a value in the iterable to the variable variable until all the values ​​in the iterable have been traversed.

for example:

var a = ["a","b","c","d","e"]
    for(let i of a){

        document.write(i);
        console.log(i)

    }

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Note that although the for of loop can also traverse objects, it is not recommended.
If traversing objects, you can use for in loop.