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02-nested-boolean-logic.js
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02-nested-boolean-logic.js
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'use strict'
/*
* This example demonstates nested boolean logic - e.g. (x OR y) AND (a OR b).
*
* Usage:
* node ./examples/02-nested-boolean-logic.js
*
* For detailed output:
* DEBUG=json-rules-engine node ./examples/02-nested-boolean-logic.js
*/
require('colors')
const { Engine } = require('json-rules-engine')
async function start () {
/**
* Setup a new engine
*/
const engine = new Engine()
// define a rule for detecting the player has exceeded foul limits. Foul out any player who:
// (has committed 5 fouls AND game is 40 minutes) OR (has committed 6 fouls AND game is 48 minutes)
engine.addRule({
conditions: {
any: [{
all: [{
fact: 'gameDuration',
operator: 'equal',
value: 40
}, {
fact: 'personalFoulCount',
operator: 'greaterThanInclusive',
value: 5
}],
name: 'short foul limit'
}, {
all: [{
fact: 'gameDuration',
operator: 'equal',
value: 48
}, {
not: {
fact: 'personalFoulCount',
operator: 'lessThan',
value: 6
}
}],
name: 'long foul limit'
}]
},
event: { // define the event to fire when the conditions evaluate truthy
type: 'fouledOut',
params: {
message: 'Player has fouled out!'
}
}
})
/**
* define the facts
* note: facts may be loaded asynchronously at runtime; see the advanced example below
*/
const facts = {
personalFoulCount: 6,
gameDuration: 40
}
const { events } = await engine.run(facts)
events.map(event => console.log(event.params.message.red))
}
start()
/*
* OUTPUT:
*
* Player has fouled out!
*/