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Get integer number in interval with JavaScript

I want to know which is the best method to get the integer/whole number in interval with native JavaScript function?

for example if I have [1.3, 2.5] ==> given result: 2


You could use the integer value from the left value and the ceiled value from the right value and get the integer value from the middled value.

function middleInt(interval) {
    return Math.floor((Math.floor(interval[0]) + Math.ceil(interval[1])) / 2);
console.log(middleInt([1.3, 2.5]));
console.log(middleInt([1.3, 1.8]));