ko init observable array

ko-init-observable-array.js

/* Variants of initialization */
/* 1 */
self.emails = ko.mapping.fromJS(emailArray);

/* 2 */
self.emails = ko.observableArray();
ko.mapping.fromJS(emailArray, undefined, self.emails);

/* 3 */
self.emails = ko.observableArray();
emailArray.forEach(function(data, index, array) {
    var email = new UserEmail(data);
  
    self.emails.push(email);
});

/* 4 */
function UserEmail(data) {
    // koMapping.fromJS(data, {}, this);
  
    var self = this;
    self.id = ko.observable(data.id);
    self.user_id = ko.observable(data.user_id);
    self.email = ko.observable(data.email);
}    
var mapping = {create: function(options) {
    return new UserEmail(options.data);
}};
ko.mapping.fromJS(emailArray, mapping, self.emails);