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Lodash _.isMatchWith


The lodash _.isMatchWith method is a powerful tool for comparing objects to see if they match a particular criteria. With _.isMatchWith, you can compare two objects, and specify a custom function to determine how objects are compared.

The _.isMatchWith method takes three arguments: object (required), source (required), and customizer (optional).

  • object: The object to compare against source.
  • source: The object containing properties to match against object.
  • customizer: A custom function that will be used to compare properties. This function takes three arguments: (objValue, srcValue, key, object, source) where objValue is the value from object, srcValue is the value from source, key is the name of the property being compared, object is the object argument, and source is the source argument.

Here's an example usage of the _.isMatchWith method:

const object = { 'a': 1, 'b': 2 };
const source = { 'b': 2 };

const customizer = (objValue, srcValue, key) => {
  if (key === 'b') {
    return true;

const result = _.isMatchWith(object, source, customizer);
console.log(result); // true

In this example, _.isMatchWith is used to compare object against source. customizer is a function that is passed to _.isMatchWith. The customizer function checks if the property being compared is 'b', and returns true if it is. Since the b property in object and source match, result is true.

One important thing to note is that if customizer returns undefined, properties are compared using the default behavior of _.isEqual.

Overall, _.isMatchWith is a powerful tool for comparing objects, and with the ability to specify a custom comparison function, you can fine-tune the comparison to your specific needs.