How to use the isMatchWith function from lodash

Find comprehensive JavaScript lodash.isMatchWith code examples handpicked from public code repositorys.

The lodash.isMatchWith function is used to compare two objects and check if they match using a custom comparator.

lodash-contrib.commonjs.js

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module.exports.isInteger           = _.isInteger;
module.exports.isJSON              = _.isJSON;
module.exports.isLength            = _.isLength;
module.exports.isMap               = _.isMap;
module.exports.isMatch             = _.isMatch;
module.exports.isMatchWith         = _.isMatchWith;
module.exports.isNaN               = _.isNaN;
module.exports.isNative            = _.isNative;
module.exports.isNegative          = _.isNegative;
module.exports.isNil               = _.isNil;

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+ 92 other calls in file

lodash.js

GitHub: mdmarufsarker/lodash

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console.log(isMap); // => true


const isMatch = _.isMatch({ 'a': 1 }, { 'a': 1 });
console.log(isMatch); // => true


const isMatchWith = _.isMatchWith({ 'a': 1 }, { 'a': 1 }, (a, b) => a === b);
console.log(isMatchWith); // => true


const isNaN = _.isNaN(NaN);
console.log(isNaN); // => true

+ 15 other calls in file

How does lodash.isMatchWith work?

The lodash.isMatchWith function is a part of the Lodash library and is used to compare two objects and check if they match using a custom comparator. To accomplish this, the function accepts three arguments: object, source, and customizer. The object argument is the object to be compared. The source argument is the source object to compare against. The customizer argument is a custom function that can be used to compare values in the two objects. This function takes four arguments: objValue, srcValue, key, and object, and should return true if the values match, and false otherwise. The lodash.isMatchWith function performs a deep comparison between the object and source objects, comparing each key-value pair recursively. If all key-value pairs match using the custom comparator, the function returns true. Otherwise, it returns false. By using the lodash.isMatchWith function, developers can compare two objects using a custom comparator function, which can be useful in scenarios where they need to perform complex comparisons between objects.

Ai Example

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const _ = require("lodash");

const obj1 = { x: 1, y: 2, z: 3 };
const obj2 = { x: 2, y: 3, z: 4 };
const customizer = (objValue, srcValue, key) => {
  if (key === "x") {
    return objValue % 2 === srcValue % 2;
  } else {
    return objValue === srcValue;
  }
};

if (_.isMatchWith(obj1, obj2, customizer)) {
  console.log("The two objects match.");
} else {
  console.log("The two objects do not match.");
}

In this example, we're using the lodash.isMatchWith function to compare two objects and check if they match using a custom comparator. We define two objects, obj1 and obj2, that represent two sets of key-value pairs. We define a customizer function that checks if the values of the x key are both odd or both even, and returns true if they are, and false otherwise. We use the isMatchWith function to compare the obj1 and obj2 objects using the customizer function. If the two objects match according to the customizer function, we log a message indicating that they match. Otherwise, we log a message indicating that they do not match. When we run this code, it will output a message indicating whether or not the two objects match according to the custom comparator. This demonstrates how lodash.isMatchWith can be used to compare two objects using a custom comparator in JavaScript code.

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