How to convert strings to integers in JavaScript, and sum the values in an array

stringsAndSums.js

// Convert string to number
string = '12.1';
number = parseFloat(string);

// Convert float to int
myInt = Math.floor(number);

// Convert list of strings to list of ints
strings = ['1.1','2.1','3.1'];
numbers = strings.map(parseFloat);
ints = numbers.map(Math.floor);

// Sum the list of integers
add = function (a, b) { return a + b; };
intSum1 = ints.reduce(add, 0);

// Sum list of integers in a general way
sum = function (xs) {
	return xs.reduce(add, 0);
}
intSum2 = sum(ints);