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Lodash _.isEqualWith


The lodash library contains the _.isEqualWith method, which is used for comparing two values and determining if they are equivalent or not. This method is similar to the _.isEqual method, but provides an additional parameter to specify a customizer function that can be used to compare values in a customized manner.

The _.isEqualWith method takes two required arguments: value and other, which are the two values to be compared. Additionally, it takes an optional third argument, which is the customizer function. The signature of the customizer function is (value, other, index|key, object, otherObject) where the first two parameters are the values to be compared, the third parameter is the index or key where the comparison is being made (if applicable), the fourth parameter is the object containing the value being compared, and the fifth parameter is the object containing the other value being compared.

If the customizer function is not specified or is set to undefined, the comparison is made using a strict equality check (===) between the two values. However, if a customizer function is provided, it will be called for each comparison between the two values, and the result of the customizer function will be used to determine if the two values are equivalent.

The return value of the _.isEqualWith method is a boolean value that indicates whether or not the two values are equivalent. If the values are equivalent, the method returns true, otherwise it returns false.

In summary, the lodash _.isEqualWith method provides a flexible way to determine if two values are equivalent by allowing a custom comparison function to be used. This method provides a powerful tool for handling complex data structures and comparing them in a customized manner.