HbNum class

Utility class for numerical operations with null safety

Provides methods for basic arithmetic operations, comparisons, and finding min/max values with support for both num and String types. Uses Decimal for precise decimal arithmetic to avoid floating point errors.

Constructors

HbNum()

Properties

hashCode → int: The hash code for this object.
no setterinherited
runtimeType → Type: A representation of the runtime type of the object.
no setterinherited

Methods

noSuchMethod(Invocation invocation) → dynamic: Invoked when a nonexistent method or property is accessed.
inherited
toString() → String: A string representation of this object.
inherited

Operators

operator ==(Object other) → bool: The equality operator.
inherited

Static Methods

add(num? a, num? b) → Decimal: 加 a+b Adds two nullable numbers with precise decimal arithmetic
addStr(String? a, String? b) → Decimal: 加 a+b Adds two nullable strings representing numbers
addStrList(List<String?> aList) → Decimal: Sums a list of nullable strings representing numbers
divide(num? a, num? b) → Decimal: 除 a/b Divides first nullable number by second Returns zero if denominator is zero
divideStr(String? a, String? b) → Decimal: 除 a/b Divides first nullable string number by second Returns zero if denominator is zero
greaterOrEqual(num? a, num? b) → bool: 大于等于 a>=b Checks if first number is greater than or equal to second
greaterOrEqualStr(String? a, String? b) → bool: 大于等于 a>=b Checks if first string number is greater than or equal to second
greaterThan(num? a, num? b) → bool: 大于 a>b Checks if first number is greater than second
greaterThanStr(String? a, String? b) → bool: 大于 a>b Checks if first string number is greater than second
lessThan(num? a, num? b) → bool: 小于 a<b Checks if first number is less than second
lessThanStr(String? a, String? b) → bool: 小于 a<b Checks if first string number is less than second
max<T>(T? a, T? b) → T?: 最大值 Returns the maximum of two values Works with String and num types
min<T>(T? a, T? b) → T?: 最小值 Returns the minimum of two values Works with String and num types
multiply(num? a, num? b) → Decimal: 乘 a*b Multiplies two nullable numbers
multiplyStr(String? a, String? b) → Decimal: 乘 a*b Multiplies two nullable string numbers
remainder(num? a, num? b) → Decimal: 余数 a%b Calculates remainder when dividing first number by second
remainderStr(String? a, String? b) → Decimal: 余数 a%b Calculates remainder for string numbers
subtract(num? a, num? b) → Decimal: 减 a-b Subtracts second nullable number from first
subtractStr(String? a, String? b) → Decimal: 减 a-b Subtracts second nullable string number from first
subtractStrMinZero(String? a, String? b) → String: 减 a-b,最小值为0 Subtracts with minimum result of zero Returns "0" if result would be negative
thanOrEqual(num? a, num? b) → bool: 小于等于 a<=b Checks if first number is less than or equal to second
thanOrEqualStr(String? a, String? b) → bool: 小于等于 a<=b Checks if first string number is less than or equal to second