I have a string : "-10.456"
I want to convert it to -10.465 in decimal (using JavaScript) so that I can compare for greater than or lesser than with another decimal number.
Regards.
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2possible duplicate of How do I Convert a String into an Integer in JavaScript?Mike Ante– Mike Ante2014-10-24 16:07:32 +00:00Commented Oct 24, 2014 at 16:07
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2Related: How to convert string into float in javascript?Felix Kling– Felix Kling2014-10-24 16:10:33 +00:00Commented Oct 24, 2014 at 16:10
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5 Answers
The parseInt function can be used to parse strings to integers and uses this format: parseInt(string, radix);
Ex: parseInt("-10.465", 10); returns -10
To parse floating point numbers, you use parseFloat, formatted like parseFloat(string)
Ex: parseFloat("-10.465"); returns -10.465
1 Comment
Santosh
@Grice what if I am trying to add two decimal the trailing zeros are missing! +(parseFloat(3.6 + 4.4).toFixed(1)) if I use .toFixed it returns string and parseFloat return number but without decimal point/trailing zero
Simply pass it to the Number function:
var num = Number(str);
1 Comment
xzegga
Number function only works if the number does not have any other, not a number string. if you have a '-10%' Number resolve NA
Here are two simple ways to do this if the variable str = "-10.123":
#1
str = str*1;
#2
str = Number(str);
Both ways now contain a JavaScript number primitive now. Hope this helps!
Comments
In javascript, you can compare mixed types. So, this works:
var x = "-10.456";
var y = 5.5;
alert(x < y) // true
alert(x > y) // false
Comments
the shortcut is this:
"-3.30" <--- the number in string form
+"-3.30" <----Add plus sign
-3.3 <----- Number in number type.
1 Comment
CodeManX
It keeps the decimal fraction and the sign, and it appears to be the fastest in Chrome: jsperf.com/number-vs-plus-vs-toint-vs-tofloat/14 (note: some of the tests convert to int!). You can also use a minus instead of a plus to negate the number. It even supports e-notation! (
+"12.34e5") I don't understand why no one upvoted this. Are there portability issues?