function getSmallestDivisor(xVal) { if (!(xVal % 2)) return 2; if (!(xVal % 3)) return 3; var xSqrt = Math.sqrt(xVal); if (!(xSqrt % 1)) return getSmallestDivisor(xSqrt); return xVal; } or function …

getTagNames doesn't have a return statement. The only function with a return statement in your question is the anonymous function you pass to getJSON. The call to getJSON calls your …

Jun 23, 2016 · Undefined typically refers to something which has not yet been assigned a value (yet). Null refers to something which definitively has no value. In that case, I would recommend …

Mar 13, 2025 · A variable that has not been assigned a value is of type undefined. A method or statement also returns undefined if the variable that is being evaluated does not have an …

Mar 23, 2023 · In this sense, typeof operator returns 'undefined' string for an undefined value: console.log(typeof undefined === 'undefined'); // => true Of course typeof works nicely to …

Mar 13, 2024 · The undefined property is used to check if a value is assigned to a variable or not. Syntax: var x; if (typeof x === "undefined") { txt = "x is undefined"; } else { txt = "x is defined"; } …

Dec 10, 2024 · There are a few main approaches: Let‘s explore examples of each and when to use them. You can test if a value is undefined by comparing directly: // handle undefined num. …

Accessing an uninitialized variable returns undefined. Accessing a non-existing property of an object returns undefined. Accessing a out-of-bounds array element returns undefined. A …

May 28, 2024 · There are a few ways to check for ‘undefined’. 1. Using the ‘typeof’ operator: Here, ‘typeof‘ operator returns the string ‘undefined’ if the variable has not been assigned a value. …

Jul 11, 2022 · In this article, you will learn the various methods and approaches you can use to know if a variable is undefined in JavaScript. This is necessary if you want to avoid your code …