Tips for converting a callback's return value into a string

I'm working with a TypeScript code that involves an array called data. This array is structured like 

[ {employee:"Jason",employeeRole:"teacher",id:10,gender:"male"}, 
{employee:"Mark",employeeRole:"student",id:10,gender:"male"}, ... ].

My task is to present this data in a grid and the connection is established through a string type variable of the grid(field).

field: this.data.for(function(arrayItem) 
    var x = arrayItem.employee + " > " +arrayItem.employeeRole;
    return x;
});

Although it states that x is a string type while field is void (when it should be string). I'm curious as to why this happens and how I can ensure that field is recognized as a string type.

javascriptarraysangulartypescriptcallback

Answer №1

One approach is to implement a TypeScript getter method:

   get dataField() : string {
        let result = '';
        this.allData.forEach(item => {
            result += item.name + " - " + item.role;
        });
        return result;
    }

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