Some useful JavaScript helper functions.

gistfile1.js

!function(window, document, undefined) {
    var toStr = Object.prototype.toString;

    window.SJ = {
        // Check if the variable is an array.
        IsArr: function(obj) {
            return toStr.call(obj) === '[object Array]';
        },
        // Check if the variable is a function.
        IsFunc: function(obj) {
            return toStr.call(obj) === '[object Function]';
        },
        // Check if the variable is declared in the global scope.
        IsDefined: function(name) {
            return typeof(window[name]) != 'undefined';
        },
        FormatStr: function(str, token, val) {
            return str.replace(token, val);
        },
        GetUnixTime: function() {
            return (new Date()).getTime();
        },
        EncodeURL: function(url) {
            return encodeURIComponent(url);
        },
        DecodeURL: function(url) {
            return decodeURIComponent(url);
        },
        GetKeyCode: function(e) {
            return e.charCode ? e.charCode : e.keyCode;
        },
        DoAsync: function(func) {
            setTimeout(func, 0);
        },
        ParseInt: function(str) {
            return parseInt(str, 10);
        },
        FindText: function(hayStack, needle) {
            for (var i = 0; i < hayStack.length; ++i) {
                if (hayStack.substring(i) == needle) {
                    return i;
                }
            }

            return -1;
        },
        GetStr: function(str) {
            if (!str || null == str) {
                return '';
            } else {
                return str;
            }
        },
        Map: function(arr, func) {
            for (var i = 0; i < arr.length; ++i) {
                func(arr[i]);
            }
        },
        ArrayContains: function(arr, val) {
            for (var i = 0; i < arr.length; ++i) {
                if (arr[i] == val) {
                    return true;
                }
            }

            return false;
        }
    };
}(this, document);

window.SJ.Split = function(str, etc) {
    var etcs;
    if (SJ.IsArr(etc)) {
        etcs = etc;
    } else {
        etcs = [etc];
    }

    for (var i = 0; i < etcs.length; ++i) {
        if ('&' == etcs[i]) {
            str = str.replace(/&/g, etcs[0]);
        } else {
            str = str.replace(etcs[i], etcs[0]);
        }
    }

    var tmp = str.split(etcs[0]);

    var ret = [];
    for (var i = 0; i < tmp.length; ++i) {
        if (tmp[i].length > 0) {
            ret.push(tmp[i]);
        }
    }

    return ret;
}