Sandbox::https://github.com/cherkavi/javascripting/blob/master/03-arrow-functions.js

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// given data

let list = [5, 6, 7, 8, 9];

let list2 = [19, 16, 15];

console.log(`filtering (>7) and mapping(+5): ${list.filter(x => x>7).map( x => x + 5 )}`);

let moreThanSevenFunction = (x) => x>7;

console.log(`filtering with function and mapping(+5): ${list.filter(moreThanSevenFunction).map(x => x + 5 )}`);

console.log(`concatenating: ${list.concat(list2)}`);

let output = [];

list2.concat(list).forEach(element => output.push(element));

console.log(`forEach, collect everything into "output" variable: ${output}`);

let objectWithFunction = {

name: "just a name",

echo: () => {

console.log(this.name)

}

};

console.log(`not working inside object: ${objectWithFunction.echo()}`);