To create a decimal number with JavaScript, you can use the following syntax:
[dm_code_snippet background=”yes” background-mobile=”yes” slim=”no” line-numbers=”no” bg-color=”#abb8c3″ theme=”dark” language=”php” wrapped=”no” height=”” copy-text=”Copy Code” copy-confirmed=”Copied”]
var decimalNumber = 3.14;
[/dm_code_snippet]
You can also use the Number constructor to create a decimal number:
[dm_code_snippet background=”yes” background-mobile=”yes” slim=”no” line-numbers=”no” bg-color=”#abb8c3″ theme=”dark” language=”php” wrapped=”no” height=”” copy-text=”Copy Code” copy-confirmed=”Copied”]
var decimalNumber = new Number(3.14);
[/dm_code_snippet]
You can also use the parseFloat function to create a decimal number from a string:
[dm_code_snippet background=”yes” background-mobile=”yes” slim=”no” line-numbers=”no” bg-color=”#abb8c3″ theme=”dark” language=”php” wrapped=”no” height=”” copy-text=”Copy Code” copy-confirmed=”Copied”]
var decimalNumber = parseFloat("3.14");
[/dm_code_snippet]
Note that the parseFloat function will only return the decimal portion of the string if it is followed by a valid numeric character. For example:
[dm_code_snippet background=”yes” background-mobile=”yes” slim=”no” line-numbers=”no” bg-color=”#abb8c3″ theme=”dark” language=”php” wrapped=”no” height=”” copy-text=”Copy Code” copy-confirmed=”Copied”]
parseFloat("3.14hello") // returns 3.14
parseFloat("3.14.5") // returns 3.14
parseFloat("3.14 5") // returns 3.14
[/dm_code_snippet]
Here are a few more things you might want to know about working with decimal numbers in JavaScript:
- You can use the
toFixedmethod to round a decimal number to a specific number of decimal places. For example:[dm_code_snippet background=”yes” background-mobile=”yes” slim=”no” line-numbers=”no” bg-color=”#abb8c3″ theme=”dark” language=”php” wrapped=”no” height=”” copy-text=”Copy Code” copy-confirmed=”Copied”]
var num = 3.14159; num.toFixed(2); // returns "3.14" num.toFixed(3); // returns "3.142"
[/dm_code_snippet]
Note that the
toFixedmethod returns a string, not a number, so if you want to perform further calculations with the rounded value, you will need to convert it back to a number usingparseFloatorNumber. - You can use the
Math.roundfunction to round a decimal number to the nearest integer. For example:[dm_code_snippet background=”yes” background-mobile=”yes” slim=”no” line-numbers=”no” bg-color=”#abb8c3″ theme=”dark” language=”php” wrapped=”no” height=”” copy-text=”Copy Code” copy-confirmed=”Copied”]
Math.round(3.14); // returns 3 Math.round(3.6); // returns 4
[/dm_code_snippet]
- You can use the
Math.ceilfunction to round a decimal number up to the nearest integer. For example:[dm_code_snippet background=”yes” background-mobile=”yes” slim=”no” line-numbers=”no” bg-color=”#abb8c3″ theme=”dark” language=”php” wrapped=”no” height=”” copy-text=”Copy Code” copy-confirmed=”Copied”]
Math.ceil(3.14); // returns 4 Math.ceil(3.6); // returns 4
[/dm_code_snippet]
You can also use the
Math.floorfunction to round a decimal number down to the nearest integer. For example:[dm_code_snippet background=”yes” background-mobile=”yes” slim=”no” line-numbers=”no” bg-color=”#abb8c3″ theme=”dark” language=”php” wrapped=”no” height=”” copy-text=”Copy Code” copy-confirmed=”Copied”]
Math.floor(3.14); // returns 3 Math.floor(3.6); // returns 3
[/dm_code_snippet]
