TypeError: this.responsearray.find is not a function angular

I am getting the below error when trying to countryName in the response array.

TypeError: this.responsearray.find is not a function


Here is my ts code

this is what I declared

responsearray: any;
editCountry(row){
let founditem = this.responsearray.find(item => item.countryName==row);
console.log(founditem)
if(founditem !== undefined){
const dialogRef = this.dialog.open(popupcomponent, {
width: '800px',
panelClass: 'custom-modalbox',
disableClose: true,
data: {pageValue:founditem}
});

dialogRef.afterClosed().subscribe(result => {
console.log('The dialog was closed');
if (!result) {
this.loadData();
}
});
}
}


Here is my Interface

export interface assumption {
countryID: number;
CountryName: string;
UserId: number;
UserName: string;
JoiningDate: String;
BirthDate: String;
OverallLength:number;}


Please let me know what I am doing wrong here.

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