parseIntRadixes

Reports parseInt calls that are missing or have an invalid radix parameter.

✅ This rule is included in the ts logical and logicalStrict presets.

When using the parseInt() function it is common to omit the second argument, the radix, and let the function try to determine from the first argument what type of number it is. By default, parseInt() will autodetect decimal and hexadecimal (via 0x prefix). Prior to ECMAScript 5, parseInt() also autodetected octal literals, which caused problems because many developers assumed a leading 0 would be ignored.

This confusion led to the suggestion that you always use the radix parameter to parseInt() to eliminate unintended consequences.


function parseInt(string: string, radix?: number): number
Converts a string to an integer.
@param ― string A string to convert into a number.
@param ― radix A value between 2 and 36 that specifies the base of the number in string.
If this argument is not supplied, strings with a prefix of '0x' are considered hexadecimal.
All other strings are considered decimal.
parseInt("071");


function parseInt(string: string, radix?: number): number
Converts a string to an integer.
@param ― string A string to convert into a number.
@param ― radix A value between 2 and 36 that specifies the base of the number in string.
If this argument is not supplied, strings with a prefix of '0x' are considered hexadecimal.
All other strings are considered decimal.
parseInt(
const someValue: string
someValue);


var Number: NumberConstructor
An object that represents a number of any kind. All JavaScript numbers are 64-bit floating-point numbers.
Number.
NumberConstructor.parseInt(string: string, radix?: number): number
Converts A string to an integer.
@param ― string A string to convert into a number.
@param ― radix A value between 2 and 36 that specifies the base of the number in string.
If this argument is not supplied, strings with a prefix of '0x' are considered hexadecimal.
All other strings are considered decimal.
parseInt("071");


function parseInt(string: string, radix?: number): number
Converts a string to an integer.
@param ― string A string to convert into a number.
@param ― radix A value between 2 and 36 that specifies the base of the number in string.
If this argument is not supplied, strings with a prefix of '0x' are considered hexadecimal.
All other strings are considered decimal.
parseInt("10", 1);


function parseInt(string: string, radix?: number): number
Converts a string to an integer.
@param ― string A string to convert into a number.
@param ― radix A value between 2 and 36 that specifies the base of the number in string.
If this argument is not supplied, strings with a prefix of '0x' are considered hexadecimal.
All other strings are considered decimal.
parseInt("10", 37);


function parseInt(string: string, radix?: number): number
Converts a string to an integer.
@param ― string A string to convert into a number.
@param ― radix A value between 2 and 36 that specifies the base of the number in string.
If this argument is not supplied, strings with a prefix of '0x' are considered hexadecimal.
All other strings are considered decimal.
parseInt("071", 10);


function parseInt(string: string, radix?: number): number
Converts a string to an integer.
@param ― string A string to convert into a number.
@param ― radix A value between 2 and 36 that specifies the base of the number in string.
If this argument is not supplied, strings with a prefix of '0x' are considered hexadecimal.
All other strings are considered decimal.
parseInt("071", 8);


var Number: NumberConstructor
An object that represents a number of any kind. All JavaScript numbers are 64-bit floating-point numbers.
Number.
NumberConstructor.parseInt(string: string, radix?: number): number
Converts A string to an integer.
@param ― string A string to convert into a number.
@param ― radix A value between 2 and 36 that specifies the base of the number in string.
If this argument is not supplied, strings with a prefix of '0x' are considered hexadecimal.
All other strings are considered decimal.
parseInt(
const someValue: string
someValue, 10);


function parseInt(string: string, radix?: number): number
Converts a string to an integer.
@param ― string A string to convert into a number.
@param ― radix A value between 2 and 36 that specifies the base of the number in string.
If this argument is not supplied, strings with a prefix of '0x' are considered hexadecimal.
All other strings are considered decimal.
parseInt("10", 16);


function parseInt(string: string, radix?: number): number
Converts a string to an integer.
@param ― string A string to convert into a number.
@param ― radix A value between 2 and 36 that specifies the base of the number in string.
If this argument is not supplied, strings with a prefix of '0x' are considered hexadecimal.
All other strings are considered decimal.
parseInt("10", 
const radix: number
radix);

Options

This rule is not configurable.

When Not To Use It

If you are confident that your codebase always uses decimal strings without leading zeros, it may be preferable to disable this rule.

Equivalents in Other Linters

Made with ❤️‍🔥 around the world by the Flint team and contributors.

parseIntRadixes

Examples

Options

When Not To Use It

Further Reading

Equivalents in Other Linters