checkcond

Checks digit, date or string value against condition string.

For usage stand alone or e.g. in decision tables -> DMN Notation.

Usage

const compiler = require('checkcond').Compiler;
const check = require('checkcond').Check;

let condString = '[7..10]';
let x = 8;
let cond = compiler(condString);
let result = check(x, cond);    // => true

or via combined processing of compile + check:

const checkDirect = require('checkcond').CheckDirect;

let condString = '[7..10]';
let x = 8;
let result = checkDirect(x, condString);    // => true

Examples

Check digits.

'< 1.000'.

      x=-5 => true
      x=0.001 => true
      x=8 => false
      x=10000 => false

">= 5"

      x=4 => false
      x=5 => true
      x=5.001 => true
      x=8 => true

">= 5.001"

      x=5 => false
      x=5.001 => true
      x=8 => true

'[5..10]' between 5 and 10

      x=5 => true
      x=10 => true
      x=11 => false

'< 10, [5..100]' less then 10 or between 5 and 100

      x=1 => true
      x=5 => true
      x=100 => true
      x=101 => false

'< 1000, !([5..100])' less then 1000 and not between 5 and 100

      x=-50 => true
      x=4 => true
      x=5 => false
      x=100 => false
      x=100.1 => true

'[5.05..10.05],[70..100],-10.56'

      x=5.06 => true
      x=85 => true
      x=20 => false
      x=-10.56 => true
      x=-10 => false
      x=100 => true

'not(5,[7..9],12)'

      x=5 => false
      x=6 => true
      x=7 => false
      x=9.05 => true
      x=12 => false
      x=13 => true

Check dates

Supported date formats for conditions and values are:

• mm/dd/yyyy
• yyyy/mm/dd
• yyyy-mm-dd
• dd.mm.yyyy

'< 01/01/2017'.

      x='10/12/2015' => true
      x='05/03/2017' => false

'> 03.11.2017'.

      x='12/01/2017' => true
      x='10/04/2017' => false

'[01/01/2017..01/01/2018]'.

      x='10/12/2015' => false
      x='01/01/2017' => true
      x='05/06/2017' => true
      x='01/01/2018' => true
      x='01/01/2019' => false
      x='05/03/2019' => false

'not([01/01/2017..01/01/2018])'.

      x='10/12/2015' => true
      x='01/01/2017' => false
      x='05/06/2017' => false
      x='01/01/2018' => false
      x='01/01/2019' => true
      x='05/03/2019' => true

Check strings against arrays

"'AL','FGH','NO'"

      x='AL' => true
      x='AF' => false

"AL,FGH,NO" works also

      x='AL' => true
      x='AF' => false

"not('AL','FGH','NO')"

      x='AL' => false
      x='AF' => true

"not(AL,FGH,NO)"

      x='AL' => false
      x='AF' => true

"!('AL','FGH','NO')"

      x='AL' => false
      x='AF' => true

Other interesting implementation I found

js-feel.