Get current user groups via CSOM (JavaScript) and REST API

You can find all current user groups in SharePoint using CSOM (JavaScript). Here is the code I used to find groups :

function GetCurrentUserGroups() {

    var clientContext = new SP.ClientContext.get_current();
    this.currentUser = clientContext.get_web().get_currentUser();
    clientContext.load(this.currentUser);

    this.userGroups = this.currentUser.get_groups();
    clientContext.load(this.userGroups);
    clientContext.executeQueryAsync(Function.createDelegate(this, this.OnQuerySucceeded), Function.createDelegate(this, this.OnQueryFailed));
}

function OnQuerySucceeded(sender, args) {
    var g1 = "Visiteurs LMRH"; var g2 = "Visiteurs CASA"; var g3 = "Visiteurs CA";
    var membership = "LMRH";
    var groupsEnumerator = this.userGroups.getEnumerator();
    while (groupsEnumerator.moveNext()) {
        var group= groupsEnumerator.get_current();
        var groupTitle = group.get_title();
        //do something
    }
}

function OnQueryFailed(sender, args) {
    alert('Request failed. ' + args.get_message() + '\n' + args.get_stackTrace());
}

ExecuteOrDelayUntilScriptLoaded(GetCurrentUserGroups, 'SP.js');

You can also use the Rest API to get current user groups and below the code to do that :

function GetCurrentUserGroups()
{
    var requestUrl = _spPageContextInfo.webServerRelativeUrl + '/_api/web/currentuser/?$expand=groups';
    return $.ajax({
            url: requestUrl,
            async: false,
            method: "GET",
            contentType: "application/json;odata=verbose",
            headers: {  
             "Accept": "application/json;odata=verbose"
            }
        });
}

GetCurrentUserGroups()
.done(function(data)
{
    var userGroups = data.d.Groups.results;
    var currentUserGroups = [];
    for(i = 0; i < userGroups.length; ++i){
        currentUserGroups.push(userGroups[i].LoginName);
    }
})
.fail(
function(error){
    console.log(JSON.stringify(error));
});

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