Writing Arrow Functions with Parameters

• Just like a regular function, you can pass arguments into an arrow function.

const double = (item) => item * 2;
double(4);
double(4) would return the value 8.

• It is possible to pass more than one argument into an arrow function.

const myConcat = (arr1, arr2) => arr1.concat(arr2);

console.log(myConcat([1, 2, 3,], [4, 5])); will display [1, 2, 3, 4, 5]

• Note:Java string concat() method concatenates multiple strings. This method appends the specified string at the end of the given string and returns the combined string. We can use concat() method to join more than one strings.