Why is my function returning undefined?

Why is my function returning undefined?

A method or statement also returns undefined if the variable that is being evaluated does not have an assigned value. A function returns undefined if a value was not returned .

Can a promise return undefined?

The behavior of the handler function follows a specific set of rules. If a handler function: returns a value, the promise returned by then gets resolved with the returned value as its value. doesn’t return anything, the promise returned by then gets resolved with an undefined value.

Is undefined valid in JSON?

Undefined is not a valid JSON type. All javascript objects are not valid JSON and vice versa. All other values will be sent to the response but undefined won’t be sent.

What is an undefined value in math?

Undefined is a term used when a mathematical result has no meaning. More precisely, undefined “values” occur when an expression is evaluated for input values outside of its domain. (If no complex numbers) (If no complex numbers)

How do you check for undefined?

If it is undefined, it will not be equal to a string that contains the characters “undefined”, as the string is not undefined. You can check the type of the variable: if (typeof(something) != “undefined”) …

How do you return a value from Promise?

Promises don’t “return” values, they pass them to a callback (which you supply with . then()). It’s probably trying to say that you’re supposed to do resolve(someObject); inside the promise implementation. Then in your then code you can reference someObject to do what you want.

How do you return a value from a Promise?

Promise resolve() method: If the value is a promise then promise is returned. If the value has a “then” attached to the promise, then the returned promise will follow that “then” to till the final state. The promise fulfilled with its value will be returned.

What is undefined math example?

An expression in mathematics which does not have meaning and so which is not assigned an interpretation. For example, division by zero is undefined in the field of real numbers.

How do you write undefined in math?

The expression 00 is undefined in arithmetic, as explained in division by zero (the same expression is used in calculus to represent an indeterminate form). Mathematicians have different opinions as to whether 00 should be defined to equal 1, or be left undefined.

What is undefined in algebra?

How do we know when a numerical expression is undefined? It is when the denominator equals zero. When we have a denominator that equals zero, we end up with division by zero. We can’t divide by zero in math, so we end up with an expression that we can’t solve.