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In this font-size resizing tutorial:
Quick and easy font resizing
the author uses parseFloat with a second argument, which I read here:
parseFloat() w/two args
Is supposed to specify the base of the supplied number-as-string, so that you can feed it '0x10' and have it recognized as HEX by putting 16 as the second argument.
The thing is, no browser I've tested seems to do this.
Are these guys getting confused with Java?
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The parseFloat() function is used to accept the string and convert it into a floating-point number. If the string does not contain a numeral value or If the first character of the string is not a Number then it returns NaN i.e, not a number.
The parseFloat() method parses a value as a string and returns the first number.
parseFloat is a bit slower because it searches for first appearance of a number in a string, while the Number constuctor creates a new number instance from strings that contains numeric values with whitespace or that contains falsy values.
JavaScript provides two methods for converting non-number primitives into numbers: parseInt() and parseFloat() . As you may have guessed, the former converts a value into an integer whereas the latter converts a value into a floating-point number.
No, they're getting confused with parseInt(), which can take a radix parameter. parseFloat(), on the other hand, only accepts decimals. It might just be for consistency, as you should always pass a radix parameter to parseInt() because it can treat numbers like 010 as octal, giving 8 rather than the correct 10.
Here's the reference for parseFloat(), versus parseInt().
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Here's a quickie version of parseFloat that does take a radix. It does NOT support scientific notation. Undefined behavior when given strings with digits outside the radix. Also behaves badly when given too many digits after the decimal point.
function parseFloatWithRadix(s, r) {
r = (r||10)|0;
const [b,a] = ((s||'0') + '.').split('.');
const l1 = parseInt('1'+(a||''), r).toString(r).length;
return parseInt(b, r) +
parseInt(a||'0', r) / parseInt('1' + Array(l1).join('0'), r);
}
parseFloatWithRadix('10.8', 16) gives 16.5
gist: https://gist.github.com/Hafthor/0a60f918d50113600d7c67252e68a02d
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