Baseline Widely available
The Number.parseInt()
static method parses a string argument and returns an integer of the specified radix or base.
function roughScale(x, base) {
const parsed = Number.parseInt(x, base);
if (Number.isNaN(parsed)) {
return 0;
}
return parsed * 100;
}
console.log(roughScale(" 0xF", 16));
// Expected output: 1500
console.log(roughScale("321", 2));
// Expected output: 0
Syntax
Number.parseInt(string)
Number.parseInt(string, radix)
Parameters
string
The value to parse, coerced to a string. Leading whitespace in this argument is ignored.
radix
Optional
An integer between 2
and 36
that represents the radix (the base in mathematical numeral systems) of the string
.
If radix
is undefined or 0
, it is assumed to be 10
except when the number begins with the code unit pairs 0x
or 0X
, in which case a radix of 16
is assumed.
An integer parsed from the given string
.
If the radix
is smaller than 2
or bigger than 36
, or the first non-whitespace character cannot be converted to a number, NaN
is returned.
This method has the same functionality as the global parseInt()
function:
Number.parseInt === parseInt; // true
Its purpose is modularization of globals. Please see parseInt()
for more detail and examples.
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