// Basic lerp
function lerp (min, max, amount) {
    return min + amount * (max - min);
}

// Lerp values in string
function lerpAllNumbers (a, b, amount) {
    var aNumbers = separateNumbers(a);
    var bNumbers = separateNumbers(b);
    var returnValue = null;
    if (aNumbers.length === bNumbers.length) {
        for (var i = 0; i < aNumbers.length; i++) {
            var searchString = aNumbers[i].value + aNumbers[i].extension;
            var newValue = lerp(aNumbers[i].value, bNumbers[i].value, amount).toFixed(3) + aNumbers[i].extension;
            returnValue = a.toString().replace(searchString, newValue);
        }
        return returnValue;
    }
}

// Separate numbers from string and create object with value and extension
function separateNumbers(text) {
    var splitter = text.toString().split(" ");
    var returnArray = [];
    splitter.forEach(function(item){
        var numberObj = {
            value: parseFloat(item),
            extension: item.replace(/^-?d+((.|,)d+)?/g, '')
        }
        returnArray.push(numberObj);
    });
    return returnArray;
}