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concordance

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concordance

Compare, format, diff and serialize any JavaScript value

  • 5.0.4
  • latest
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  • npm
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536K
increased by4.7%
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What is concordance?

Concordance is a powerful assertion library for JavaScript that provides detailed and human-readable diffs for objects, arrays, and other data structures. It is particularly useful for testing and debugging, as it helps developers quickly identify differences between expected and actual values.

What are concordance's main functionalities?

Detailed Object Comparison

This feature allows you to compare two objects and get a detailed diff of their differences. The output is human-readable and helps in quickly identifying discrepancies.

const concordance = require('concordance');
const actual = { a: 1, b: 2 };
const expected = { a: 1, b: 3 };
const result = concordance.diff(actual, expected);
console.log(result);

Array Comparison

This feature allows you to compare two arrays and get a detailed diff of their differences. It is useful for testing and debugging array data structures.

const concordance = require('concordance');
const actual = [1, 2, 3];
const expected = [1, 2, 4];
const result = concordance.diff(actual, expected);
console.log(result);

Custom Serializers

This feature allows you to create custom serializers to handle specific data types in your comparisons. It provides flexibility in how data is represented in the diffs.

const concordance = require('concordance');
const customSerializer = {
  describe(value) {
    return { text: `Custom: ${value}` };
  },
  test(value) {
    return typeof value === 'string';
  }
};
const actual = 'hello';
const expected = 'world';
const result = concordance.diff(actual, expected, { serializers: [customSerializer] });
console.log(result);

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Package last updated on 13 Mar 2021

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