cond-table



Checks data object against decision table.

-> DMN Notation.

Usage

``js
const Table = require('cond-table').Table;

var testTable = {
description: 'Applicant Risk rating', // optional
hitPolicy: 'First', // optional (actual only First possible)
input: {
'age': {
description: 'Applicant Age', // optional
type: 'number' // optional
},
'hist': {
description: 'Medical History',
type: 'string'
}
},
output: {
'risk': {
description: 'Risk Rating', //optional
type: 'string' //optional
}
},
rules: {
'older 60 / good': {
'age': '>60',
'hist': 'good',
'risk': 'Medium'
},
'older 60 / bad': {
'age': '>60',
'hist': 'bad',
'risk': 'High'
},
'mid age': {
'age': '[25..60]',
'risk': 'Medium'
},
'kids / good': {
'age': '<25',
'hist': 'good',
'risk': 'Low'
},
'kids / bad)': {
'age': '<25',
'hist': 'bad',
'risk': 'Medium'
}
}
};

// example data sets, to be checked
var testData = [
{ 'age': '65', 'hist':'good'},
{ 'age': '70', 'hist':'bad'},
{ 'age': '26', 'hist':'good'},
{ 'age': '20', 'hist':'bad'},
{ 'age': '10', 'hist':'good'}
];

// create an instance
let table = new Table(testTable);

// use table to process data sets
for (let i=0; i< testData.length; i++) {
let result = table.result(testData[i]); // result.risk is set now
console.log(result.risk);
};

`

More Examples

$3

`js
// create an instance direct..
let table = new Table(testTable);

// ...or set and compile separately
let table = new Table();
table.compile(testTable);
`

$3

`js
let testTable = {
description: 'Simple table',
hitPolicy: 'Unique',
input: {
'x': {
description: 'Input x',
type: 'number'
},
'y': {
description: 'Input y',
type: 'number',
default: 2
},
'a': {
description: 'Formula Input',
type: 'expression', // optional
expression: '2 * x + y' // check expr-eval for syntax
}
},
output: {
'z': {},
't': {}
},
rules: {
'First rule': {
'x': '< 5, [20..30]',
'y': '> 6,[30..40]',
'a': '< 15', // uses the calculated value
'z': '7',
't': 'first'
},
'Second rule': {
'x': '> 5',
'a': '> 15',
'z': '2',
't': 'second'
}
}
};
`

$3

`js
input: {
'x': {
description: 'Input x',
type: 'number',
default: '0' // 0 must be in quotes
},
'y': {
description: 'Input y',
type: 'number',
default: 2 // with or without quotes
}
}
``