ES6: Use the Rest Parameter with Function Parameters

Tell us what’s happening:
From one of the help post, I could get the code but I didn’t understand what does a and b signifies here.
Can someone please help me understand

Your code so far

const sum = (...args) => {
return args.reduce((a, b) => a + b, 0);

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Challenge: Use the Rest Parameter with Function Parameters

Link to the challenge:

a is the accumulator (initial value set to 0 in this case) and b is the current element being processed.

You can check the docs for reduce and have a look at the fCC challenge on reduce.

MDN: Array.prototype.reduce()

Functional Programming: Use the reduce Method to Analyze Data

1 Like

Thank you for your reply, I watched a few videos on reduce which helped me understand the concept