How to call method recursively in typescript

Question

I want to call the filterArr inside the filterArr. Here is my implementation.

 filterArr(array, search) {
        var result = [];
        array.forEach((a)=> {
            var temp = [],
                 o = {},
                found = false;

            if (a.name === search) {
                this.o.name = a.name;
                found = true;
            }
            if (Array.isArray(a.children)) {
                temp = this.filterArr(a.children, search);//***Cannot read property 'filterArr' of undefined***
                if (temp.length) {
                    this.o.children = temp;
                    found = true;
                }
            }
            if (found) {
                result.push(o);
            }
        });
        return result;
    }

How to call the filterArr method without any error?

Answer 1

你必须使用Arrow function得到坚持正确的this ，所以你需要改变array.forEach(function (a) {使用`Arrow功能

array.forEach((a) => {