Hi, I just learnt about Javascript Functions and would like to know the method for finding out average using Arrays and Functions in JS. I have linked a screenshot of my code, can you please help me?
1 Answer
const scores = [60, 75, 21, 43];
const avg = scores.reduce((accumulator, currentValue) => accumulator + currentValue)/scores.length;
console.log(avg);The Reduce function when used on an array will iterate over its entirety, with each iteration having access to a Accumulator (A single variable shared across all iterations) and a CurrentValue (Represents the current interation value). Using this you can add all the values together and divide the result by the array's length.
This can also be replaced with a function, "(accumulator, currentValue) => ..." is a lambda expression and is basically just shorthand for "function funcNameHere(accumulator, currentValue) { ... }"
Lambda expressions can also declare a body just like a normal function. "(param) => { ... }"
2 Comments
Dave Newton
YMMV, but I believe (a) if there are multiple duplicates, (b) the OP didn't make an attempt to solve the problem, and (c) the OP doesn't describe the specific issue(s) they're having, an answer isn't super-appropriate.
Gavin
Yes, rules are rules. Just giving a break considering they are brand new to this and trying not to discourage someone just learning for the first time. Mistakes will be made.
return. That's not a valid attempt in my book.