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example.html
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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1">
<title>Functional Programming Example</title>
</head>
<body>
<script src="ramda.js"></script>
<script>
ramda.installTo(this);
</script>
<script>
var getIncompleteTaskSummariesForMember_imperative = function(memberName) {
return fetchData()
.then(function(data) {
return data.tasks;
})
.then(function(tasks) {
var results = [];
for (var i = 0, len = tasks.length; i < len; i++) {
if (tasks[i].member === memberName) {
results.push(tasks[i]);
}
}
return results;
})
.then(function(tasks) {
var results = [];
for (var i = 0, len = tasks.length; i < len; i++) {
if (!tasks[i].complete) {
results.push(tasks[i]);
}
}
return results;
})
.then(function(tasks) {
var results = [], task;
for (var i = 0, len = tasks.length; i < len; i++) {
task = tasks[i];
results.push({
id: task.id,
dueDate: task.dueDate,
title: task.title,
priority: task.priority
})
}
return results;
})
.then(function(tasks) {
tasks.sort(function(first, second) {
return first.dueDate - second.dueDate;
});
return tasks;
});
};
var TaskList = (function() {
var TaskList = function(/*Task[]*/ tasks) {
this.tasks = tasks;
};
TaskList.prototype.chooseByMember = function(memberName) {
var results = [];
for (var i = 0, len = this.tasks.length; i < len; i++) {
if (this.tasks[i].member === memberName) {
results.push(this.tasks[i]);
}
}
this.tasks = results;
};
TaskList.prototype.chooseByCompletion = function(completion) {
var results = [];
for (var i = 0, len = this.tasks.length; i < len; i++) {
if (this.tasks[i].complete == completion) {
results.push(this.tasks[i]);
}
}
this.tasks = results;
};
TaskList.prototype.getSummaries = function() {
var results = [], task;
for (var i = 0, len = this.tasks.length; i < len; i++) {
task = this.tasks[i];
results.push({
id: task.id,
dueDate: task.dueDate,
title: task.title,
priority: task.priority
})
}
return new TaskList(results);
};
TaskList.prototype.sort = function(/*TaskListSorter*/ sorter) {
this.tasks.sort(sorter.getSortFunction());
};
return TaskList;
}());
var TaskListSorter = (function() {
var TaskListSorter = function(propName) {
this.propName = propName;
};
TaskListSorter.prototype.getSortFunction = function() {
var propName = this.propName;
return function(first, second) {
return first[propName] < second[propName] ? -1 : first[propName] > second[propName] ? +1 : 0;
}
};
return TaskListSorter;
}());
var getIncompleteTaskSummariesForMember_objectOriented = function(memberName) {
return fetchData()
.then(function(data) {
var taskList = new TaskList(data.tasks);
taskList.chooseByMember(memberName);
taskList.chooseByCompletion(false);
var newTaskList = taskList.getSummaries();
newTaskList.sort(new TaskListSorter("dueDate"));
return newTaskList.tasks;
});
};
var propMatches = use(pipe).over(get, eq);
//var getIncompleteTaskSummariesForMember_functional = function(memberName) {
// return fetchData()
// .then(get('tasks'))
// .then(filter(propMatches('member', memberName)))
// .then(reject(propMatches('complete', true)))
// .then(map(pick(['id', 'dueDate', 'title', 'priority'])))
// .then(sortBy(get('dueDate')));
//};
var getIncompleteTaskSummariesForMember_functional = function(memberName) {
return fetchData()
.then(get('tasks'))
.then(filter(andFn(propMatches('member', memberName), notFn(propMatches('complete', true)))))
.then(map(pick(['id', 'dueDate', 'title', 'priority'])))
.then(sortBy(get('dueDate')));
};
</script>
<script>
var thenChain = function() {
var chain = [];
return {
resolve: function(val) {return pipe.apply(null, chain)(val);},
then: function(fn) {chain.push(fn); return this;}
};
};
</script>
<script>
var data = {
result: "SUCCESS",
interfaceVersion: "1.0.3",
requested: new Date(),
lastUpdated: new Date("10/16/2013 10:52:39"),
tasks: [
{id: 104, complete: false, priority: "high", dueDate: "11/29/2013",
member: "Scott", title: "Do something", created: "9/22/2013"},
{id: 105, complete: false, priority: "medium", dueDate: "11/22/2013",
member: "Mike", title: "Do something else", created: "9/22/2013"},
{id: 107, complete: true, priority: "high", dueDate: "11/22/2013",
member: "Mike", title: "Fix the foo", created: "9/22/2013"},
{id: 108, complete: false, priority: "low", dueDate: "11/15/2013",
member: "Punam", title: "Adjust the bar", created: "9/25/2013"},
{id: 110, complete: false, priority: "medium", dueDate: "11/15/2013",
member: "Scott", title: "Rename everything", created: "10/2/2013"},
{id: 112, complete: true, priority: "high", dueDate: "11/27/2013",
member: "Lena", title: "Alter all quuxes", created: "10/5/2013"}
// {id: , complete: , priority: "", dueDate: "", member: "", title: "", created: ""},
]
};
var newTasks = map((function() {
var base = pick(["id", "complete", "priority", "member", "title"]);
date = construct(Date);
return function(task) {
var newTask = base(task);
newTask.dueDate = new Date(task.dueDate);
newTask.created = new Date(task.created);
return newTask;
}
}()), data.tasks);
data.tasks = newTasks;
// In a real system, this would involve a server-side check to see if we're up-to-date.
var fetchData = function() {
var deferred = thenChain();
setTimeout(function() {
deferred.resolve(data);
}, 0);
return deferred;
};
</script>
<script>
getIncompleteTaskSummariesForMember_imperative("Scott").then(function(data) {
console.log("Imperative:", JSON.stringify(data, null, 4));
});
getIncompleteTaskSummariesForMember_objectOriented("Scott").then(function(data) {
console.log("Object-Oriented:", JSON.stringify(data, null, 4));
});
getIncompleteTaskSummariesForMember_functional("Scott").then(function(data) {
console.log("Functional:", JSON.stringify(data, null, 4));
});
</script>
</body>
</html>