Forum | Appery.io

Hi guys,

How do i sort an array of objects by the day of the week ( Monday, Tuesday, Wednesday, Thursday etc)?

I have a service response that pushes the data into and array and then saves the array in local storage.. this is then mapped to 2 separate lists.

pre

othernightsArray = [];
mainnightsArray = [];

for(var i = 0; i < data&#46;length; i++){
if(data&#46;NightName == "Normal"){
othernightsArray&#46;push(data);
console&#46;log(data);
}
else {
mainnightsArray&#46;push(data);
}
}

localStorage&#46;setItem("OtherNights", JSON&#46;stringify(othernightsArray));
localStorage&#46;setItem("MainNights", JSON&#46;stringify(mainnightsArray));

/pre

This works fine but before setting the local storage I want to sort the array by the day of the week.

Each object has a "Day" field.

I've used a compare function in my app to sort an array by Name alphabetically
pre

function compare(a,b) {
if (a&#46;Name < b&#46;Name)
return -1;
if (a&#46;Name b&#46;Name)
return 1;
return 0;
}

PeopleArray&#46;sort(compare);
/pre

but I'm not sure how modify this for Day (Monday, Tuesday, Wednesday, Thursday etc).

Any ideas?

Joe, an alternative to consider might be sorting the data coming back from the service using the sort parameter. Just a thought ...might not be appropriate for what you're doing ...
Bruce

Thanks for your response.

I considered this also.
but how do I sort based on the day of the week.

Using sort parameter with the Day field returns the list in alphabetical order of the day field:

Friday
Monday
Saturday
Sunday
Thursday
Tuesday
Wednesday

I'd like to have it sorted by the day in this order:

Monday
Tuesday
Wednesday
Thursday
Friday
Saturday
Sunday

I'm not sure how to sort it, either via a sort parameter, or through sorting the array.

Joe,

Read here:

http://www.javascriptkit.com/javatuto...

• you might consider adding a column to each element as you push data into your local storage array - for a value 1-7 that assigns each day of the week a value.

  And then use the tutorial here - on sorting an array of objects - based on the new value in the new column.

  or alternatively - you might consider adding a column to your data store - and then you can use native sorting from the database - as specified here:(which you are already aware of)

  http://docs.mongodb.org/manual/refere...

  Bruce

Thanks for the advice.

Managed to get my head around it.

pre
var othernightsArray = [];
var mainnightsArray = [];

function checkDayandOrder(){

if (data&#46;Day == "Monday"){
data&#46;order = "1";
}

if (data&#46;Day == "Tuesday"){
data&#46;order = "2";
}

if (data&#46;Day == "Wednesday"){
data&#46;order = "3";
}

if (data&#46;Day == "Thursday"){
data&#46;order = "4";
}

if (data&#46;Day == "Friday"){
data&#46;order = "5";
}

if (data[i]&#46;Day == "Saturday"){
data[i]&#46;order = "6";
}

if (data[i]&#46;Day == "Sunday"){
data[i]&#46;order = "7";
}

}

for(var i = 0; i < data&#46;length; i++){
if(data[i]&#46;NightName == "Normal"){
checkDayandOrder();
othernightsArray&#46;push(data[i]);
console&#46;log(data[i]);

}
else {
mainnightsArray&#46;push(data[i]);
checkDayandOrder();
}
}

function compareDay(a,b) {
if (a&#46;order < b&#46;order)
return -1;
if (a&#46;order b&#46;order)
return 1;
return 0;
}
othernightsArray&#46;sort(compareDay);
mainnightsArray&#46;sort(compareDay);

localStorage&#46;setItem("OtherNights", JSON&#46;stringify(othernightsArray));
localStorage&#46;setItem("MainNights", JSON&#46;stringify(mainnightsArray));
console&#46;log(othernightsArray);

/pre

congrats by the way Joe - very nice implementation....