React Js : How can i use index number to disable button ( if index = 4 then disable button )

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i have to create a component where one person can add upto 4 addresses for doing this i have used slice(0,4) in map function but i have to make button disabled when 4 addresses are entered

How can i do this i need a solution

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>Solution :

if(locations.length < 4) { <button type="button"> Add </button> }
So basically the button will appear or dissapear based on if the condition is true or false.