Easy localStorage caching

ls.js

/**
 * Stores the given key, value pair in localStorage, if it is available
 */
function setLocalStorageValue(key, value) {
    if (window.localStorage) {
        try {
            localStorage.setItem(key, value);
        } catch (e) {
            // For some reason we couldn't save the value :(
            console.log("ERROR | Unable to save to localStorage!", key, value, e);
        }
    }
}

/**
 * Gets a value from localStorage
 * Returns the default if localStorage is unavailable, or there is no
 * stored value for that key
 */
function getLocalStorageValue(key, def) {
    if (window.localStorage) {
        var value = localStorage.getItem(key);
        if((value == null) || (value == "undefined")) {
            /* We had a bit of trouble reading the value assumedly
             * Regardless, try save the value for next time
             */
            setLocalStorageValue(key, def);
            
            value = def;
        }
        	
        // Try to (intelligently) cast the item to a number, if applicable
        if(!isNaN(value*1)) value = value*1;
        
        return value;
    }
    
    // If localStorage isn't available, return the default
    return def;
}

/**
 * Clears the given key's value from localStorgage
 */
function clearLocalStorageValue(key) {
    if (window.localStorage) {
        try {
            localStorage.removeItem(key);
        } catch (e) {
            // For some reason we couldn't clear the value :S
            console.log("ERROR | Unable to clear localStorage value!", key, e);
        }
    }
}

Fixed Modernizr dependancy. Not sure how I missed that :/

Added Number casting to getLocalStorageValue

Fixed typo.