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example.js
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example.js
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const Djel = require('./lib').default;
const djel = Djel();
// add Transform
djel.addTransforms({
upper: (val) => val.toUpperCase(),
find: (arr, by) => arr.find(by),
});
const variables = {
name: { first: 'Sterling', last: 'Archer' },
assoc: [
{ first: 'Lana', last: 'Kane' },
{ first: 'Cyril', last: 'Figgis' },
{ first: 'Pam', last: 'Poovey' },
],
age: 36,
};
let res;
// find in an array
res = djel.evaluate('assoc|find(@.first == "Lana").last', variables);
console.log(res); // Output: Kane
// Do math
res = djel.evaluate('age * (3 - 1)', variables);
console.log(res); // Output: 72
// Concatenate
res = djel.evaluate('name.first + " " + name["la" + "st"]', variables);
console.log(res); // Output: Sterling Archer
// Compound
res = djel.evaluate('assoc|find(@.last == "Figgis").first == "Cyril" && assoc|find(@.last == "Poovey").first == "Pam"', variables);
console.log(res); // Output: true
// Use array indexes
res = djel.evaluate('assoc[1]', variables);
console.log(res.first + ' ' + res.last); // Output: Cyril Figgis
// Use conditional logic
res = djel.evaluate('age > 62 ? "retired" : "working"', variables);
console.log(res); // Output: working
res = djel.evaluate('"duchess"|upper + " " + name.last|upper', variables);
console.log(res); // Output: DUCHESS ARCHER
// Add your own operators
// Here's a case-insensitive string equality
djel.addBinaryOps({
'_=': {
priority: 30,
fn: (left, right) => left.toLowerCase() === right.toLowerCase(),
},
});
res = djel.evaluate('"Guest" _= "gUeSt"');
console.log(res); // Output: true