angular.js - use of ts forEach

Question

This is like this, if I have a three-level array datas, I want to simplify it through ts, return the data of the innermost layer, and then use it directly on the template.
I don’t know much about the use of forEach, and I got an error in practice. Beginners, I hope the masters don’t complain. Baidu has forEach without detailed explanation.

Answer 1

forEach It seems that it is not from TS, but from ES. Usage is very simple

var a = [1, 2, 3]
a.forEach(function (e) {
    console.log(e);
});

This way you will get 1, 2, 3

If it is a multi-level array,

var b = [[1, 2], [3, 4], [5, 6]];
b.forEach(function (elementOutside) {
    elementOutside.forEach(function (elementInside) {
        console.log(elementInside);
    })
})

This way you get 1, 2, 3, 4, 5, 6

I don’t know what your specific needs are. . It would be best to add some additional explanation. Maybe what you need is not forEach 而是 map but map

Reference:
ES: https://developer.mozilla.org...

TS: https://www.typescriptlang.or...