How to use the isError function from lodash

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

lodash.isError is a function that checks if a value is an Error object or not.

lodash-contrib.commonjs.js

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module.exports.isDecreasing        = _.isDecreasing;
module.exports.isElement           = _.isElement;
module.exports.isEmpty             = _.isEmpty;
module.exports.isEqual             = _.isEqual;
module.exports.isEqualWith         = _.isEqualWith;
module.exports.isError             = _.isError;
module.exports.isEven              = _.isEven;
module.exports.isFinite            = _.isFinite;
module.exports.isFloat             = _.isFloat;
module.exports.isFunction          = _.isFunction;

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+ 92 other calls in file

lodash.js

GitHub: mdmarufsarker/lodash

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console.log(isEqual); // => true


const isEqualWith = _.isEqualWith({ 'a': 1 }, { 'a': 1 }, (a, b) => a === b);
console.log(isEqualWith); // => true


const isError = _.isError(new Error);
console.log(isError); // => true


const isFinite = _.isFinite(1);
console.log(isFinite); // => true

+ 15 other calls in file

How does lodash.isError work?

lodash.isError is a method that checks if a given value is an Error object, and returns true if it is, and false otherwise. When given a value, lodash.isError checks if the value is an object, and if so, whether it is an instance of the Error constructor function. If it is an instance of the Error constructor function, it returns true, and false otherwise. The Error object is a built-in object in JavaScript that provides a standardized way to represent and throw errors. It has a message property, which provides a description of the error, and a stack trace property, which provides information about the call stack at the time the error was thrown.

Ai Example

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const _ = require("lodash");

const myError = new Error("This is an error!");
const myString = "This is not an error.";

console.log(_.isError(myError)); // Output: true
console.log(_.isError(myString)); // Output: false

In this example, we're using lodash.isError to check whether a given value is an Error object or not. We create two variables - myError and myString - one of which is an Error object and the other is just a regular string. We then use _.isError to test each variable, and we can see from the output that the function correctly identifies myError as an Error object, while myString is not.

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