parseIntDef()

parseIntDef(value, defaultValue, radix?): number | null

Parses a string to an integer with a fallback default value.

note

Returns default for null, undefined, empty strings, and NaN results.

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Parameters

value: Nullish<string>

The string value to parse (can be nullish or empty).

defaultValue: Nullish<number> = null

The value to return if parsing fails.

radix?: number

The radix (base 2-36) for parsing.

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Returns: number | null

The parsed integer or default value.

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See Also

parseFloatDef

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Since

1.0.0

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Example

parseIntDef('42');            // => 42
parseIntDef('invalid');       // => null
parseIntDef('invalid', 0);    // => 0
parseIntDef('1010', null, 2); // => 10 (binary)
parseIntDef('FF', null, 16);  // => 255 (hex)

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How it works?

Parses a string to an integer with a fallback default value, supporting custom radix.

Validation Flow

Common Inputs

Value	Default	Radix	Result
'42'	null	-	42
'invalid'	0	-	0
'1010'	null	2	10
'FF'	null	16	255
null	0	-	0

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Use Cases

Parse integers safely 📌

Convert strings to integers with nullish handling and default values. Essential for pagination (page numbers, limits) and ID handling.

#parse#integer#safe#default#pagination#radix

const page = parseIntDef(params.page, 1);
const limit = parseIntDef(params.limit, 20);

Specify radix explicitly

Parse binary, octal, or hexadecimal strings safely. Useful for low-level data processing or color parsing.

#radix#binary#octal#hexadecimal#parsing#base

const flags = parseIntDef("1010", 0, 2); // Binary to decimal: 10
const color = parseIntDef("FF", 0, 16);  // Hex to decimal: 255