true or false) is a primitive. You can check this using the custom isPrimitive() function: console.log(isPrimitive(true)); // true console.log(isPrimitive(false)); // true When you use Boolean() as a function (or wrapper around a primitive value), it coerces the argument given ...
Using the.includes()Function to Check if Array Contains Value in JavaScript Theincludes()function of JavaScript checks whether a given element is present in an array. It returns a boolean value. Hence, it is best suited inifcondition checks. ...
We can also use thefind()method to check if an array includes a value. This method returns the first element in the array that satisfies the provided testing function. letfruits=["apple","banana","orange"];lethasBanana=fruits.find(fruit=>fruit==="banana");console.log(hasBanana);// "ba...
Here, we have discussed how to check whether the value exists within the array or not. There are various ways to do this, but we have discussed three ways.
JavaScript has several ways to convert a string to a boolean. One way is to use the Boolean() function, which returns the boolean value of a given variable. For example: let str = "true"; let bool = Boolean(str); console.log(bool); // outputs: true Another way is to use the =...
Topic:JavaScript / jQueryPrev|Next Answer: Use the===Operator You can simply use the strict equality operator (===) if you wants to convert a string representing a boolean value, such as, 'true' or 'false' into an intrinsic Boolean type in JavaScript. ...
You can simply use the typeof operator to determine or check if a variable is a string in JavaScript.In the following example just play with the myVar value to see how it works:ExampleTry this code » // Sample variable var myVar = 'Hello'; // Test if variable is a string if(...
What is a null check? In JavaScript, null represents an intentional absence of a value, indicating that a variable has been declared with a null value on purpose. On the other hand, undefined represents the absence of any object value that is unintentional. A null check determines whether a...
Often, we want to check the type of a value, we simply usetypeof typeof'string';// 'string'typeof100;// 'number'typeoftrue;// 'boolean'typeoffalse;// 'boolean'typeoffunction(){};// 'function'typeof{};// 'object'typeof[];// 'object' <-- 😱 ...
Indeed, if you're just checking the boolean status, then I'd just use the comparative operator instead of using Math.sign. But where Math.sign shines is it returns a number value. This means you can do calculations.const number = 5; number > 0; // true Math.sign(number); // 1 ...