List.Contains

Indicates whether the list contains the value.

Syntax

List.Contains(
    list as list,
    value as any,
    optional equationCriteria as any
) as logical

Remarks

Indicates whether the list list contains the value value. Returns true if value is found in the list, false otherwise. An optional equation criteria value, equationCriteria, can be specified to control equality testing.

Examples

Example #1

Find if the list {1, 2, 3, 4, 5} contains 3.

List.Contains({1, 2, 3, 4, 5}, 3)

Result:

true

Example #2

Find if the list {1, 2, 3, 4, 5} contains 6.

List.Contains({1, 2, 3, 4, 5}, 6)

Result:

false

Category

List.Membership functions

More examples

Implement this function to retrieve or calculate the service URL based on the data source path parameters

GetAuthorizationUrlFromWwwAuthenticate = (url as text) as text =>
    let
        // Sending an unauthenticated request to the service returns
        // a 302 status with WWW-Authenticate header in the response. The value will
        // contain the correct authorization_uri.
        // 
        // Example:
        // Bearer authorization_uri="https://login.microsoftonline.com/{tenant_guid}/oauth2/authorize"
        responseCodes = {302, 401},
        endpointResponse = Web.Contents(url, [
            ManualCredentials = true,
            ManualStatusHandling = responseCodes
        ])
    in
        if (List.Contains(responseCodes, Value.Metadata(endpointResponse)[Response.Status]?)) then
            let
                headers = Record.FieldOrDefault(Value.Metadata(endpointResponse), "Headers", []),
                wwwAuthenticate = Record.FieldOrDefault(headers, "WWW-Authenticate", ""),
                split = Text.Split(Text.Trim(wwwAuthenticate), " "),
                authorizationUri = List.First(List.Select(split, each Text.Contains(_, "authorization_uri=")), null)
            in
                if (authorizationUri <> null) then
                    // Trim and replace the double quotes inserted before the url
                    Text.Replace(Text.Trim(Text.Trim(Text.AfterDelimiter(authorizationUri, "=")), ","), """", "")
                else
                    error Error.Record("DataSource.Error", "Unexpected WWW-Authenticate header format or value during authentication.", [
                        #"WWW-Authenticate" = wwwAuthenticate
                    ])
        else
            error Error.Unexpected("Unexpected response from server during authentication.");