How do I check whether an array contains a string in TypeScript?

Question

Currently I am using Angular 2.0. I have an array as follows:

var channelArray: Array = [\'one\', \'two\', \'three\'];

How ca

Answer 1

do like this:

departments: string[]=[];
if(this.departments.indexOf(this.departmentName.trim()) >-1 ){
            return;
    }