Converts words to a decimal value. e.g. one thousand five hundred fifty two and five cents = 1552.05

string2decimal.js

function getValue(str) {
    switch (str) {
        case 'one':
          return 1;
        case 'two':
            return 2;
        case 'three':
            return 3;
        case 'four':
            return 4;
        case 'five': 
            return 5;
        case 'fifty':
            return 50;
    }
    return false;
}

function getMagnitude(str) {
    switch (str) {
        case 'thousand':
            return 1000;
        case 'hundred':
            return 100;
        case 'cents':
            return 0.01;
    }
    return false;
}

function getDecimal(str) {
    var words = str.toLowerCase().split(' ');
    var decimal = 0;
    var NO_VALUE = -1;
    var currentVal = NO_VALUE;

    for (var i = 0; i < words.length; i++) {
        var value = getValue(words[i]);

        if (value !== false) {
            if (currentVal == NO_VALUE) {
                currentVal = value;
            } else {
                currentVal = currentVal + value;
            }
        } else {
            var magnitude = getMagnitude(words[i]);

            if (currentVal !== NO_VALUE) {
                if (magnitude !== false) {
                    currentVal = currentVal * magnitude
                }
                decimal += currentVal;
                currentVal = NO_VALUE;
            } 
        }
    }
    if (currentVal !== NO_VALUE) {
        decimal += currentVal;
    }
    return decimal;
}

// sample run
getDecimal("one thousand five hundred fifty two and five cents")