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JavaScript getDay() Method: Date Object

Description

The getDay() method is used to get the day of the week of a given date according to local time.

The value returned by getDay() method is an integer corresponding to the day of the week: 0 for Sunday, 1 for Monday, 2 for Tuesday, 3 for Wednesday, 4 for Thursday, 5 for Friday, 6 for Saturday.

Version

Implemented in JavaScript 1.0

Syntax

getDay()
javascript date object getday

Example:

In the following web document, getDay() method returns the day of the week of a given date and current date.

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
<head>
<meta http-equiv="content-type" content="text/html; charset=iso-8859-1" />
<title>JavaScript date object - getDay() method example</title>
</head>
<body>
<h1 style="color: red">JavaScript date object : getDay() method</h1>
<hr />
<script type="text/javascript">
//This is done to make the following JavaScript code compatible to XHTML. <![CDATA[
newyear2008 = new Date("January 1, 2008 11:10:00")
day = newyear2008.getDay()
document.write("The day of the week of "+newyear2008+" is : "+day+"<br />")
current_date = new Date()
cday = current_date.getDay()
document.write("The day of the week of current date is : "+cday)
//]]>
</script>
</body>
</html>

View the example in the browser

Supported Browser

Internet Explorer 7 Firefox 3.6 Google Chrome 7 Safari 5.0.1 Opera 10
Yes Yes Yes Yes Yes

See also:

JavaScript Core objects, methods, properties.

Previous: JavaScript getDate() Method: Date Object
Next: JavaScript getFullYear() Method: Date Object

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JavaScript: Tips of the Day

Reduce method

[1, 2, 3, 4].reduce((x, y) => console.log(x, y));

The first argument that the reduce method receives is the accumulator, x in this case. The second argument is the current value, y. With the reduce method, we execute a callback function on every element in the array, which could ultimately result in one single value.
In this example, we are not returning any values, we are simply logging the values of the accumulator and the current value.
The value of the accumulator is equal to the previously returned value of the callback function. If you don't pass the optional initialValue argument to the reduce method, the accumulator is equal to the first element on the first call.
On the first call, the accumulator (x) is 1, and the current value (y) is 2. We don't return from the callback function, we log the accumulator and current value: 1 and 2 get logged.
If you don't return a value from a function, it returns undefined. On the next call, the accumulator is undefined, and the current value is 3. undefined and 3 get logged.
On the fourth call, we again don't return from the callback function. The accumulator is again undefined, and the current value is 4. undefined and 4 get logged.

Ref: https://bit.ly/323Y0P6

 

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