What could be causing my function to return as undefined the second time it's invoked?

Question

What could be causing my function to return as undefined the second time it's invoked?

Within my approach

private onDataLoadSuccessful(users: User[], roles: Role[]) {

    this.alertService.stopLoadingMessage();
    this.loadingIndicator = false;
    this.dataSource.data = users.map(data => {
        let newData: User;
        newData = Utilities.toCamel((data));
        return newData;
    });

    this.allRoles = roles.map(function (data) {
        let newData: Role;
        newData = Utilities.toCamel(data);
        return newData;
    });
}

I am utilizing the Utilities.toCamel(data) function twice. Firstly, to convert the Users[] array to camel case and secondly, on the Roles[] array

The issue arises when it is called a second time:

 this.allRoles = roles.map(function (data) {
        let newData: Role;
        newData = Utilities.toCamel(data);
        return newData;
    });

This leads to the error message:

TypeError: Cannot read property 'toCamel' of undefined

Is there something that I am overlooking? Thanks!

angular typescript

Answer 1

Answer №1

Approach it as if it's your initial attempt:

For each role in the roles array, we are assigning it to a new variable newData after converting it to camel case using Utilities.toCamel function:
this.allRoles = roles.map(data => {
    let newData: Role;
    newData = Utilities.toCamel(data);
    return newData;
});

Answer 2

Approach it as if it's your initial attempt:

For each role in the roles array, we are assigning it to a new variable newData after converting it to camel case using Utilities.toCamel function:
this.allRoles = roles.map(data => {
    let newData: Role;
    newData = Utilities.toCamel(data);
    return newData;
});

Answer 3

Answer №2

When working with roles, it is important to utilize arrow functions, denoted by () =>, rather than the traditional function keyword. Take a look at this example:

this.roleList = list.map((item) => {
    let updatedItem: Role;
    updatedItem = DataProcessor.convertToCamel(item);
    return updatedItem;
});

Answer 4

When working with roles, it is important to utilize arrow functions, denoted by () =>, rather than the traditional function keyword. Take a look at this example:

this.roleList = list.map((item) => {
    let updatedItem: Role;
    updatedItem = DataProcessor.convertToCamel(item);
    return updatedItem;
});

What could be causing my function to return as undefined the second time it's invoked?

Answer №1

Answer №2

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