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Lodash _.conformsTo


The lodash _.conformsTo method is a utility function that is used to create a predicate function. A predicate function is a function that returns either true or false, based on some conditions. The _.conformsTo method takes an object as its first argument and a predicate function as its second argument. It returns a new function that can be used to test if an object meets certain conditions.

The first argument to _.conformsTo is an object. This object represents the conditions that need to be met for the predicate function to return true. The keys of the object are property names, and the values are the conditions that the properties need to meet. For example, if we want to create a predicate function that returns true if an object has a name property that is a string and a age property that is a number, we can create an object like this:

const conditions = {
  name: value => typeof value === 'string',
  age: value => typeof value === 'number'

The second argument to _.conformsTo is a predicate function. This function takes an object as its argument and returns true if the object meets the conditions specified in the first argument. This function is created by calling the _.conformsTo method with the conditions object as its first argument.

Once we have created our predicate function, we can use it to test objects. We can call the function and pass an object as its argument. If the object meets the conditions specified in the conditions object, the function will return true. If not, it will return false.

One use case for the _.conformsTo method is to filter arrays of objects. We can use the Array.filter method to return only the objects that meet the conditions specified by our predicate function. For example:

const myObjects = [
  { name: 'John', age: 30 },
  { name: 'Jane', age: 'not a number' },
  { name: 'Bob', age: 25 }

const conditions = {
  name: value => typeof value === 'string',
  age: value => typeof value === 'number'

const predicate = _.conformsTo(conditions);

const filteredObjects = myObjects.filter(predicate);

// filteredObjects will be: 
// [
//   { name: 'John', age: 30 },
//   { name: 'Bob', age: 25 }
// ]

In this example, we create an array of objects. We then create our conditions object and use it to create our predicate function. We call Array.filter and pass our predicate function as the argument. The filter method returns a new array that contains only the objects that meet the conditions specified by our predicate function.

In conclusion, the _.conformsTo method is a useful utility function that can be used to create predicate functions for testing objects. It can be used in a variety of contexts, such as filtering arrays of objects.