sumOfPositive.ts

/* 

You get an array of numbers, return the sum of all of the positives ones.

Example [1,-4,7,12] => 1 + 7 + 12 = 20

Note: if there is nothing to sum, the sum is default to 0.

*/

export function positiveSum(arr: number[]): number {
	return arr.reduce((a, b) => (b > 0 ? a + b : a), 0);
}