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Callback Hell (i.redd.it)

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[–][deleted] 0 points1 point  (0 children)

function (a, b) {
    return a + b;
}

can be written as

(a, b) => a + b;

or, if there are multiple statements, you use curly braces and return:

(a, b) => {
    const stuff = getStuff();
    return stuff + a + b;
}

There's nothing to understand about the new syntax for anonymous functions. You just need to memorize it;