Array Map can be used to create a new array by calling a function on each element on a another array using .map() method. This is done declaratively alternate to the imperative approch using Array.push() inside a loop.
Examples
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const cities = [
{ name: 'Bangalore'},
{ name: 'Chennai'},
{ name: 'Kochi'},
{ name: 'Trivandrum'}
];
By using .map() we can create a new array cityNames[] declaratively
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const cityNames = cities.map(city => cities.name)
The function which need to be called on the each element of the original array is passed as an argument to the map()