Unary plus operator in JavaScript

The unary plus (+) operator is a unary operator and converts its operand to a number, if it isn’t already. It is equivalent to the Number() constructor called as a function. Let us see some examples of the Unary + operator and what does it imply in different scenarios

+new Date; // implies Number(new Date)
a + “” // implies String(a)
+a // implies Number(a), so “+1.2” becomes 1.2
a = null; a = +a; // value of a is now 0;
Unary plus is the preferred way of converting something into a number!


Note: The unary plus operator does not change the sign of an integer. So if the number is  negative, the unary + does not change the sign to a positive

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About The Author

Suprotim Agarwal
Suprotim Agarwal, Developer Technologies MVP (Microsoft Most Valuable Professional) is the founder and contributor for DevCurry, DotNetCurry and SQLServerCurry. He is the Chief Editor of a Developer Magazine called DNC Magazine. He has also authored two Books - 51 Recipes using jQuery with ASP.NET Controls. and The Absolutely Awesome jQuery CookBook.

Follow him on twitter @suprotimagarwal.

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