The getUTCday() method returns the day of the week in the specified date according to universal time(UTC). The value returned by getUTCDay() is an integer between 0 and 6 corresponding to the day of the week as follows.
|Value||Day of the week|
The following web document getUTCDay() method returns the day of the week of a given date and current date according to universal time.
|Internet Explorer 7||Firefox 3.6||Google Chrome 7||Safari 5.0.1||Opera 10|
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[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.
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