Q891. What are the differences between pure and impure functions?
Some of the major differences between pure and impure function are as below, | Pure function | Impure function | | ----------------------------------- | -----------------...
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Q892. What is referential transparency?
An expression in javascript that can be replaced by its value without affecting the behaviour of the program is called referential transparency. Pure functions are refere...
Q893. What are the possible side-effects in javascript?
A side effect is the modification of the state through the invocation of a function or expression. These side effects make our function impure by default. Below are some ...
Q894. What are compose and pipe functions?
The "compose" and "pipe" are two techniques commonly used in functional programming to simplify complex operations and make code more readable. They are not native to Jav...
Q895. What is module pattern?
Module pattern is a designed pattern used to wrap a set of variables and functions together in a single scope returned as an object. JavaScript doesn't have access specif...
Q896. What is Function Composition?
It is an approach where the result of one function is passed on to the next function, which is passed to another until the final function is executed for the final result...
Q897. How to use await outside of async function prior to ES2022?
Prior to ES2022, if you attempted to use an await outside of an async function resulted in a SyntaxError. ```javascript await Promise.resolve(console.log("Hello await"));...
Q898. What is the purpose of the this keyword in JavaScript?
The `this` keyword in JavaScript refers to **the object that is executing the current function**. Its value is determined by **how a function is called**, not where it is...
Q899. What are the uses of closures?
Closures are a powerful feature in programming languages like JavaScript. They allow functions to retain access to variables from their containing (enclosing) scope even ...
Q900. What are the phases of execution context?
The execution context in JavaScript is a data structure that stores the information necessary for executing a piece of code. It includes the code itself, the values of th...