Author: Editorial Team
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What is a unary function?
A unary function is a function that accepts exactly one argument. The term “unary” comes from the prefix “uni-“, meaning “one.” Unary functions are commonly used in mathematics and programming. Characteristics of a Unary Function Example of Unary Function
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What is a higher order function?
A higher-order function in JavaScript is a function that either: Higher-order functions are a core concept in functional programming and are widely used in JavaScript for tasks like iteration, transformations, and handling asynchronous operations. Characteristics of Higher-Order Functions Examples of Higher-Order Functions Taking Functions as Arguments The classic example is the array methods like map,…
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What is a first order function?
A first-order function is a function that does not take other functions as arguments or return functions as its result. It operates directly on values and performs computations or operations on them. Characteristics of First-Order Functions Example of First-Order Functions add is a first-order function because it takes two numbers as input and returns a…
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What is a first-class function?
In JavaScript, a first-class function refers to the ability of functions to be treated like any other value. This means functions in JavaScript can: These properties make functions “first-class citizens” in JavaScript. Key Characteristics of First-Class Functions Assigning to Variables Passing as Arguments Returning Functions Storing in Data Structures Why First-Class Functions are Powerful Higher-Order…
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What is the difference between Map and Object in JavaScript?
In JavaScript, both Map and Object can store key-value pairs, but they have different features, performance characteristics, and use cases. Here’s a detailed comparison: Aspect Object Map Key Types Keys must be strings or symbols (other types are coerced to strings). Keys can be of any type, including objects, functions, and primitives. Order of Keys…
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Array.prototype.splice() method
1. Overview The splice() method modifies an array directly by adding, removing, or replacing elements at specific positions. The splice() method is a mutating method. It may change the content of this. If the specified number of elements to insert differs from the number of elements being removed, the array’s length will be changed as…
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Array.prototype.slice() method
1. Introduction The slice() method creates a shallow copy of a specified section of an array, returning it as a new array object. The selection is based on the indices provided as start and end parameters, with end being exclusive. This operation does not alter the original array. 2. Example 3. Using negative indices In…
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What is the difference between call, apply and bind in JavaScript?
In JavaScript, this refers to the object that is currently executing the function. Its value depends on how the function is called. However, there are situations where you might want to explicitly set the value of this. This is where call, apply, and bind come into play. 1. The call Method The call method invokes…
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What are the possible ways to create an Object in JavaScript?
There are many ways to create the JavaScript object. 1. Object literal syntax In JavaScript, an object literal is a straightforward way to define objects using key-value pairs. Here’s an example: Object literal property values can be of any data type, including array, function, and nested object. 2. Object constructor The Object constructor is a…
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What is the difference between Encoding, Encryption and Hashing?
1. Overview The terms encryption and encoding are often mistakenly used interchangeably, and hashing is sometimes misrepresented as a form of encryption. These misconceptions can lead to significant errors in implementing security measures. To address this, let’s delve into a high-level overview of these concepts and clarify their distinct purposes and differences. Understanding the differences…