Number Separator

Underscores should be used as thousand separator in large numbers with a configurable number of digits. In other words, there should be an underscore after every 3 digits in the integral as well as the fractional part of a number.

  • Identifier: number_separator
  • Enabled by default: No
  • Supports autocorrection: Yes
  • Kind: style
  • Analyzer rule: No
  • Minimum Swift compiler version: 5.0.0
  • Default configuration:
    KeyValue
    severity warning
    minimum_length 0
    exclude_ranges []

Non Triggering Examples

let foo = -100

let foo = -1_000

let foo = -1_000_000

let foo = -1.0001

let foo = -1_000_000.0000001

let binary = -0b10000

let binary = -0b1000_0001

let hex = -0xA

let hex = -0xAA_BB

let octal = -0o21

let octal = -0o21_1

let exp = -1_000_000.000000e2

let foo: Double = -(200)

let foo: Double = -(200 / 447.214)

let foo = -6.2832e-6

let foo = +100

let foo = +1_000

let foo = +1_000_000

let foo = +1.0001

let foo = +1_000_000.0000001

let binary = +0b10000

let binary = +0b1000_0001

let hex = +0xA

let hex = +0xAA_BB

let octal = +0o21

let octal = +0o21_1

let exp = +1_000_000.000000e2

let foo: Double = +(200)

let foo: Double = +(200 / 447.214)

let foo = +6.2832e-6

let foo = 100

let foo = 1_000

let foo = 1_000_000

let foo = 1.0001

let foo = 1_000_000.0000001

let binary = 0b10000

let binary = 0b1000_0001

let hex = 0xA

let hex = 0xAA_BB

let octal = 0o21

let octal = 0o21_1

let exp = 1_000_000.000000e2

let foo: Double = (200)

let foo: Double = (200 / 447.214)

let foo = 6.2832e-6

Triggering Examples

let foo = -↓10_0

let foo = -↓1000

let foo = -↓1000e2

let foo = -↓1000E2

let foo = -↓1__000

let foo = -↓1.0001

let foo = -↓1_000_000.000000_1

let foo = -↓1000000.000000_1

let foo = -↓6.2832e-6

let foo = +↓10_0

let foo = +↓1000

let foo = +↓1000e2

let foo = +↓1000E2

let foo = +↓1__000

let foo = +↓1.0001

let foo = +↓1_000_000.000000_1

let foo = +↓1000000.000000_1

let foo = +↓6.2832e-6

let foo = ↓10_0

let foo = ↓1000

let foo = ↓1000e2

let foo = ↓1000E2

let foo = ↓1__000

let foo = ↓1.0001

let foo = ↓1_000_000.000000_1

let foo = ↓1000000.000000_1

let foo = ↓6.2832e-6

let foo: Double = -(↓100000)

let foo: Double = -(↓10.000000_1)

let foo: Double = -(↓123456 / ↓447.214214)

let foo: Double = +(↓100000)

let foo: Double = +(↓10.000000_1)

let foo: Double = +(↓123456 / ↓447.214214)

let foo: Double = (↓100000)

let foo: Double = (↓10.000000_1)

let foo: Double = (↓123456 / ↓447.214214)