[英]What is the purpose of a parameter named “undefined” in a JavaScript function?
[英]FlowType : why function types have named parameters ? What is their purpose?
讓我們考慮以下代碼:
const add = (whatToAdd:number) : (addTo:number) =>number =>{
return (addToThis)=>addToThis+whatToAdd
}
const add3 = add(3)
const res = add3(4)
為什么我不能寫number => number
而不是(addTo:number) =>number
?
名稱addTo
可以有什么作用?
您可以在流程0.34中:
const add = (whatToAdd:number) : (number => number) =>{
return (addToThis)=>addToThis+whatToAdd
}
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