JavaScript Array Methods [map(), flatMap(), filter(), reduce()] #30

JavaScript Array Methods [map(), flatMap(), filter(), reduce()] #30

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// map method
let number1 = points.map(myDouble);

console.log('Multiply by 2: ', number1);

function myDouble(value) {
// return value * 2;
return [value, value * 2];
}

//flatMap method
let number2 = points.flatMap(myFunction);

console.log('Multiply by 2: ', number2);

function myFunction(value) {
// return value * 2;
return [value, value * 2];
}


// filter method
let over18 = points.filter(myFunction);

console.log('Greater than 20: ', over18);

function myFunction(value) {
return value > 20;
}

// reduce method
let mySum = points.reduce(myResult);

console.log('Sum of all elements: ', mySum);

function myResult(sum, element) {
return sum + element;
}