На примере будет более понятно:
                  
                  
                  type Obj = {
                  
                  
                    field1: string;
                  
                  
                    field2: number;
                  
                  
                  };
                  
                  
                  const obj1: Obj = { field1: 'obj1', field2: 1 };
                  
                  
                  const obj2: Obj = { field1: 'obj2', field2: 2 };
                  
                  
                  const objList = [obj1, obj2]
                  
                  
                  
                  
                  
                  const getObjSetter = (index: number, fieldName: keyof Obj) => (value: ???) => {
                  
                  
                    const obj = objList[index];
                  
                  
                    obj[field] = value
                  
                  
                  
                  
                  
                    return obj
                  
                  
                  }
                  
                  
                
http://www.typescriptlang.org/play/#code/C4TwDgpgBA8gRgKygXigbwFBW1AZgSwgBsATARgC4oBnYAJ3wDsBzAbixwOJICYrGArgFs4EOuwC+7DAGMA9o1pQ5iSrEQp0eQqTUByFQjJ6ANNu58oZKFNkKlhy-CSo053VQOIep97yo8NuzyisDKiAAy+EqoANqGZGaOALoYdqFQzBDAzgDK2cBimgA8ANIQIFAQAB6FjCTUUADWFXK46ggAfAAUTCQ1-MKidGZcpAByAIZCEFTlIACUKJ1Q3QBuk0QCsx2x88lLyCuYOFAhDhqohlG0sX01yeynhrFjJFMzyZobWxDSp3RsgI6IxwghJBggA
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