JAVASCRIPT

push state array react

setArray(oldArray => [...oldArray,newValue] );

react state add to array

// Save search term state to React Hooks with spread operator and wrapper function

// Using .concat(), no wrapper function (not recommended)
setSearches(searches.concat(query))

// Using .concat(), wrapper function (recommended)
setSearches(searches => searches.concat(query))

// Spread operator, no wrapper function (not recommended)
setSearches([...searches, query])

// Spread operator, wrapper function (recommended)
setSearches(searches => [...searches, query])

push values to state array class react

this.setState(prevState => ({
  arrayvar: [...prevState.arrayvar, newelement]
}))

Correct way to push into state array

stackoverflow:https://stackoverflow.com/questions/37435334/correct-way-to-push-into-state-array