如何通过.sort（）对打字稿模型进行排序

Question

I have this code:

export interface Model{
  fields: FieldMap;
}
export interface FieldMap {  [key: string]: Field;}
export interface Field { name: string; value?: string;   }

How can I sort by key in field model?

I tring something this, but have error TS2349:

Cannot invoke an expression whose type lacks a call signature.

.fields.sort((a: any, b: any) => { if (a.key < b.key ){ return -1; }else if(a.key > b.key){ return 1; }else{ return 0; } });

Answer 1

I think you are trying to sort the FieldMap object based on key values.
Here is the link

You can try it like this:

var data = {
    fields: {
        "4": { name: 'name4', value: '4' },
        "1": { name: 'name1', value: '1' },
        "3": { name: 'name3', value: '3' },
        "2" : { name: 'name2', value: '2' }
    },
};

Object.keys(data.fields).sort((a: any, b: any) =>
{ if (a.key < b.key) { return -1; } else if (a.key > b.key) { return 1; } else { return 0; } });

alert(JSON.stringify(data.fields));