Truncating a number is a mathematical process of removing all the digits after the decimal point. In JavaScript, the **trunc()** function is used to return the integer part of a number. This function is a static function of the Math object and must be invoked through the placeholder object named Math. It calculates the integral part of a specified double-precision floating-point number.

The **trunc()** function can also be used in MySQL and SQL to truncate a given number to certain given decimals. In this tutorial, you will learn how to use the **trunc()** function in JavaScript, MySQL and SQL to truncate a number. It removes all fractional digits and truncates the number. The following example calls the **trunc()** method to truncate a positive and a negative decimal value: The following example calls the **trunc()** method to truncate both a positive and a negative Double value: To **truncate** a real number is to discard its non-integer part.

Therefore, the truncation of a (positive) number corresponds to taking the floor function. Use Math, **trunc()** to truncate a floating point number and return its integer part. This function does not round, it simply removes all digits that follow the decimal. Now you have an integer, yay ???? Math, **trunc()** just truncates (cuts) the periods and digits to its right.

It doesn't matter if the argument is a positive or negative number. ParseInt is used primarily for a string argument. So if it's numbers, it's much better to use Math, **trunc()**. If you're curious, I wrote a performance test comparing these two functions.

So when he tried to take the integer of 1e+21, he only knows how to take the value 1.Therefore, the use of ParseInt definitely has its problem. Because of this extreme case, you may want to consider using mathematical functions ???? Most modern browsers support Math, **trunc()**. I know ???? So if you need support for older browsers, use the old method ???? With computers, truncation can occur when a decimal number was typecast as an integer; it is truncated to zero decimal digits because integers cannot store non-integer real numbers. In this example, the first console log output returned 32, which is 32.65 truncated to an integer value.

Perform financial forecasting, reporting and tracking operational metrics, analyzing financial data, creating financial models, the function can be used to truncate a number with a certain accuracy. Starting with Visual Basic 15.8, double-to-integer conversion performance is optimized if you pass the value returned by the Truncate method to any of the integral conversion functions, or if the Double value returned by Truncate is automatically converted to an integer with the Strict option set to Off. The algorithm of subtracting 0.5 from a value and then rounding it (which truncates a positive number) actually has so many uses that Java has been good enough to include a method in your standard library that it will do it for you. In this example, the number of decimal places is therefore -2 the TRUNCATE () function truncated two digits to the left of the decimal points. Oracle and PostgreSQL provide the TRUNC () function that has the same functionality as the TRUNCATE () function. Note that the domains of the truncation function and the rounding function for any given return value are offset exactly 0.5.In mathematics and computer science, truncation limits the number of digits to the right of the decimal point. In order to keep things simple, let's look at the algorithm for truncating positive numbers (and the really motivated ones can see if they can find an algorithm to truncate negative numbers). However, unlike the algorithm we developed earlier that takes a positive float and truncates it to an int value, the floor function receives and returns a double value (you can confirm this in the Java class documentation).

Well, the algorithm differs slightly depending on whether a positive value (greater than or equal to zero) or a negative value (less than zero) is truncated. In this tutorial, you learned how to use the SQL TRUNCATE () function to truncate a number to a specific number of decimal places. .

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