How to use the assignInWith function from lodash

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

lodash.assignInWith is a function in the Lodash library that assigns the own and inherited enumerable properties of one or more source objects to a target object using a customizer function.

lodash-contrib.commonjs.js

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module.exports.always              = _.always;
module.exports.arity               = _.arity;
module.exports.ary                 = _.ary;
module.exports.assign              = _.assign;
module.exports.assignIn            = _.assignIn;
module.exports.assignInWith        = _.assignInWith;
module.exports.assignWith          = _.assignWith;
module.exports.at                  = _.at;
module.exports.attempt             = _.attempt;
module.exports.before              = _.before;

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+ 92 other calls in file

lodash.js

GitHub: mdmarufsarker/lodash

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console.log(assign); // => { 'a': 1, 'b': 2, 'c': 3 }


const assignIn = _.assignIn({ 'a': 1 }, { 'b': 2 }, { 'c': 3 });
console.log(assignIn); // => { 'a': 1, 'b': 2, 'c': 3 }


const assignInWith = _.assignInWith({ 'a': 1 }, { 'b': 2 }, { 'c': 3 }, (a, b) => a + b);
console.log(assignInWith); // => { 'a': 1, 'b': 2, 'c': 3 }


const assignWith = _.assignWith({ 'a': 1 }, { 'b': 2 }, { 'c': 3 }, (a, b) => a + b);
console.log(assignWith); // => { 'a': 1, 'b': 2, 'c': 3 }

+ 15 other calls in file

How does lodash.assignInWith work?

lodash.assignInWith is a function in the Lodash library that assigns the own and inherited enumerable properties of one or more source objects to a target object using a customizer function. The function takes two or more arguments: a target object to assign the properties to, one or more source objects to get the properties from, and an optional customizer function to determine the value for each property. When lodash.assignInWith is called, it iterates over each source object and assigns its enumerable properties to the target object. If a property already exists in the target object, the customizer function is called with four arguments: the target value, the source value, the property key, and the target object. The customizer function should return the value to be assigned to the target property. If the customizer function returns undefined, the property is skipped. If the customizer function is not provided, the default behavior is to assign the source value to the target value. For example, the following code uses lodash.assignInWith to assign properties to an object using a customizer function: javascript Copy code {{{{{{{ const _ = require('lodash'); const target = { a: 1, b: 2 }; const source1 = { b: 3, c: 4 }; const source2 = { c: 5, d: 6 }; const customizer = (targetValue, sourceValue, key, targetObject) => { if (key === 'b') { return targetValue + sourceValue; } }; const result = _.assignInWith(target, source1, source2, customizer); console.log(result); // Output: { a: 1, b: 5, c: 9, d: 6 } In this example, we use lodash.assignInWith to assign properties from two source objects (source1 and source2) to a target object (target) using a customizer function. The customizer function checks if the property being assigned is b. If it is, the customizer function returns the sum of the target and source values for that property. If it is not, the customizer function returns undefined, causing the default behavior of assigning the source value to the target value. Overall, lodash.assignInWith is a useful utility function for assigning properties from one or more source objects to a target object using a customizer function to determine the value for each property.

Ai Example

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const _ = require("lodash");

const target = { a: 1, b: 2 };
const source1 = { b: 3, c: 4 };
const source2 = { c: 5, d: 6 };

const customizer = (targetValue, sourceValue, key, targetObject) => {
  if (key === "b") {
    return targetValue + sourceValue;
  }
};

const result = _.assignInWith(target, source1, source2, customizer);

console.log(result);
// Output: { a: 1, b: 5, c: 9, d: 6 }

In this example, we use lodash.assignInWith to assign properties from two source objects (source1 and source2) to a target object (target) using a customizer function. The customizer function checks if the property being assigned is b. If it is, the customizer function returns the sum of the target and source values for that property. If it is not, the customizer function returns undefined, causing the default behavior of assigning the source value to the target value. Overall, lodash.assignInWith is a useful utility function for assigning properties from one or more source objects to a target object using a customizer function to determine the value for each property.

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