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Table of contents
1.
Introduction
2.
Why This Function is Used
3.
Syntax, Parameter and Return Value
3.1.
Syntax:
3.2.
Parameters:
3.3.
Return Value:
4.
Examples 
4.1.
Combining Multiple Validation Checks:
4.2.
JavaScript
4.3.
Validating Complex Conditions:
4.4.
JavaScript
4.5.
Using with Object Properties:
4.6.
JavaScript
4.7.
Filtering Based on Multiple Criteria:
4.8.
JavaScript
5.
Frequently Asked Questions
5.1.
How does _.overEvery() differ from _.overSome()?
5.2.
Can _.overEvery() handle asynchronous predicates?
5.3.
Is _.overEvery() efficient for a large number of predicates?
6.
Conclusion
Last Updated: Mar 27, 2024
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Lodash _.overEvery() Method

Author Pallavi singh
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Anubhav Sinha
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25 Jun, 2024 @ 01:30 PM

Introduction

In functional programming, particularly when dealing with complex validation logic, it's common to check if multiple conditions are met simultaneously. Lodash's _.overEvery() method simplifies this by creating a function that returns true if all of the provided predicates return truthy for a given set of arguments. 

Lodash _.overEvery() Method

This is particularly useful for aggregating multiple conditions or checks into a single validation step.

Why This Function is Used

The _.overEvery() function is used to combine multiple predicate functions into a single function that checks if all predicates pass (return truthy) for given arguments. It's essential in scenarios where an action or decision depends on the simultaneous satisfaction of multiple conditions, enabling more concise and maintainable validation logic.

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Syntax, Parameter and Return Value

Syntax:

 _.overEvery([predicates=[_.identity]])

Parameters:

[predicates=[_.identity]] (...(Function|Function[])): The functions to check.

Return Value:

 (Function) - Returns the new composite function.

Examples 

Combining Multiple Validation Checks:

  • JavaScript

JavaScript

var _ = require('lodash');

var isEven = n => n % 2 === 0;

var isPositive = n => n > 0;

var isValidNumber = _.overEvery([isEven, isPositive]);

console.log(isValidNumber(4));

console.log(isValidNumber(-2));

Output: 

true (even and positive)
false (even but not positive)


Demonstrates using _.overEvery() to create a function that checks if a number is both even and positive.

Validating Complex Conditions:

  • JavaScript

JavaScript

var hasValidLength = arr => arr.length > 2;

var allNumbers = arr => _.every(arr, _.isNumber);

var isArrayValid = _.overEvery([hasValidLength, allNumbers]);

console.log(isArrayValid([1, 2, 3]));

console.log(isArrayValid([1, 'a', true]));

Output: 

true (valid length and all numbers)
false (not all numbers)


Shows how to validate an array based on length and content type.

Using with Object Properties:

  • JavaScript

JavaScript

var isActive = obj => obj.active;

var isAdult = obj => obj.age >= 18;

var canParticipate = _.overEvery([isActive, isAdult]);

console.log(canParticipate({ age: 20, active: true }));

console.log(canParticipate({ age: 17, active: true }));

Output: 

true
false


An example of using _.overEvery() to check if an object represents an active adult.

Filtering Based on Multiple Criteria:

  • JavaScript

JavaScript

var products = [

 { name: 'Apple', category: 'fruit', stock: 10 },

 { name: 'Carrot', category: 'vegetable', stock: 0 }

];

var isFruit = product => product.category === 'fruit';

var isInStock = product => product.stock > 0;

var availableFruits = _.filter(products, _.overEvery([isFruit, isInStock]));

console.log(availableFruits);

Output:

 [{ name: 'Apple', category: 'fruit', stock: 10 }]


Demonstrates filtering a collection based on multiple conditions using _.overEvery().

Frequently Asked Questions

How does _.overEvery() differ from _.overSome()?

_.overEvery() checks that all predicates return truthy (like logical AND), whereas _.overSome() checks if any of the predicates return truthy (like logical OR).

Can _.overEvery() handle asynchronous predicates?

_.overEvery() is designed for synchronous predicate functions. Asynchronous predicates would require handling with Promises or async/await.

Is _.overEvery() efficient for a large number of predicates?

The efficiency of _.overEvery() depends on the complexity and performance of the individual predicates. For a large number of computationally intensive predicates, performance considerations may be necessary.

Conclusion

Lodash's _.overEvery() method is an effective tool for combining multiple predicate functions into a single function that checks if all conditions are met. It simplifies complex validation logic and is useful in a variety of scenarios, from data validation to conditional rendering in applications.

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