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JavaScriptAdvanced#performance#functions
JavaScriptIntermediate#functions
What is a higher-order function?
A function that takes a function as an argument or returns a function. Array methods, debounce and middleware are all higher-order functions.
Example
function withLog(fn) {
return (...args) => { console.log(args); return fn(...args); };
}
const add = withLog((a,b) => a + b);