Some JavaScript utility functions

/**
 * Trim a string
 */
function trim(str) {
    str = str + '';
    return str.replace(/^\s+|\s+$/g, '');
}

/**
 * Merge two JSONs, with controllable overwrite.
 */
function mergeJson(target, source, overwrite) {
    for (var item in source) {
        if (target[item] && typeof source[item] === 'object') {
            this.mergeJson(target[item], source[item]);
        } else if (!target[item] || overwrite === true) {
            target[item] = source[item];
        }
    }
    return target;
}

/**
 * Check if an array contains a given elements.
 */
function arrayContainsElement(arr, ele) {
    var contains = false;
    if (arr) {
        for (var i = 0; i < arr.length; i++) {
            if (this.trim(arr[i]) === this.trim(ele)) {
                contains = true;
                break;
            }
        }
    }
    return contains;
}