我有此数据:
roles = [
{roleId: "69801", role: "ADMIN"}
{roleId: "69806", role: "SUPER_ADMIN"}
{roleId: "69805", role: "RB"}
{roleId: "69804", role: "PILOTE"}
{roleId: "69808", role: "VENDEUR"}
{roleId: "69807", role: "SUPER_RB"}
]
我必须过滤我的表以检查是否存在包含角色指定值的对象。
我的功能应如下所示:
checkRoleExistence(role){
// if role exists on one of the objects return true
// else returne false
}
要使用它,我会像这样:
let ifExists = this.checkRoleExistence("PILOTE") ;
我想使用 Ecmascript 的“过滤器” 功能。
建议?
答案 0 :(得分:9)
您可以使用some
方法和解构。
let roles = [ {roleId: "69801", role: "ADMIN"}, {roleId: "69806", role: "SUPER_ADMIN"}, {roleId: "69805", role: "RB"}, {roleId: "69804", role: "PILOTE"}, {roleId: "69808", role: "VENDEUR"}, {roleId: "69807", role: "SUPER_RB"} ]
const checkRoleExistence = roleParam => roles.some( ({role}) => role == roleParam)
console.log(checkRoleExistence("ADMIN"));
console.log(checkRoleExistence("RA"));
console.log(checkRoleExistence("RB"));
答案 1 :(得分:1)
这里给出的所有答案都有一点补充。您可以使用find()获取符合您要求的值。
const index = this.roles.findIndex(role=> role.name === 'ADMIN');
if (index >-1) {
const value= this.roles[index].roleId);
}
这将为您提供roleId,它与您的查询匹配
答案 2 :(得分:0)
我为您提供了以下解决方案: check this out
export class RoleComponent implements OnInit {
roles: Role[] = [];
isRoleExist:boolean = false;
constructor() { }
ngOnInit() {
const data = this.getRoles();
this.roles = JSON.parse(data);
this.isRoleExist = this.checkRoleExistence('PILOTE');
console.log(this.isRoleExist);
}
checkRoleExistence(roleLabel: string):boolean {
return this.roles.some(r => r.roleLabel === roleLabel);
}
getRoles() {
return `[
{"roleId": "69801", "roleLabel": "ADMIN"},
{"roleId": "69806", "roleLabel": "SUPER_ADMIN"},
{"roleId": "69805", "roleLabel": "RB"},
{"roleId": "69804", "roleLabel": "PILOTE"},
{"roleId": "69808", "roleLabel": "VENDEUR"},
{"roleId": "69807", "roleLabel": "SUPER_RB"}
]`;
}
}
export class Role {
roleId: number;
roleLabel: string;
}