angular service delete from array not working code example

Example 1: angular delete from array by name

this.data = this.data.filter(item => item !== data_item);

Example 2: angular delete from array by name

deleteMsg(msg:string) {
    const index: number = this.data.indexOf(msg);
    if (index !== -1) {
        this.data.splice(index, 1);
    }        
}