Typescript : Check if object exist in array by value

Question

I have this data:

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"}
]

i have to filter my table to check if there is an object containing a specifie value of role .

My function should look like this :

checkRoleExistence(role){

// if role exists on one of the objects return true
// else returne false
}

to use it i would do s.th like this :

let ifExists = this.checkRoleExistence("PILOTE") ;

I would like to use the "filter" function of Ecmascript .

Suggestions ?

Answer 1

You can use some method and destructuring.

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"));

Answer 2

a little addition to all the answers given here. You can use find() to get value which matches your requirement.

const index = this.roles.findIndex(role=> role.name === 'ADMIN'); if (index >-1) { const value= this.roles[index].roleId); }

this will give you roleId , where it matches your query