Number Verifier Reference

Created by should().number(entry: number | null | undefined). All checks are chainable and throw ShouldError on failure; every check first asserts the entry is defined (see Concepts).

Methods

Method	Passes when	Failure message (direct)
`equals(expected: number)`	strictly equal	`${real} doesn't equal ${expected}.`
`greater(then: number)`	`entry > then` (exclusive)	`${real} is not greater then ${then}.`
`greaterOrEqual(then: number)`	`entry >= then`	—
`less(then: number)`	`entry < then` (exclusive)	`${real} is not less then ${then}.`
`lessOrEqual(then: number)`	`entry <= then`	—
`positive()`	`entry > 0`	`${real} is not positive.`
`negative()`	`entry < 0`	`${real} is not negative.`
`inRange(min: number, max: number)`	`min < entry < max` (both exclusive)	`${real} isn't in range [${min},${max}].`
`approximately(expected: number, precision: number)`	`\\|entry − expected\\| < precision` (strict)	—

Plus the inherited not and defined().

Notes

Negated checks mirror the messages: ${real} is positive, but should not., etc.
approximately is the float-safe alternative to equals.
inRange bounds are exclusive on both sides — for inclusive edges chain greaterOrEqual(min).lessOrEqual(max).

Guide: Numbers.

02 сентября 2026