SharePoint useful JavaScript objects, functions

There are several SharePoint inbuilt JavaScript objects / functions helps you to write script professional way and saves your time. The following are few you can explore more in SP.Init.debug.js and page sources.

1. _spPageContextInfo: the object exists in sharePoint pages
_spPageContextInfo.siteAbsoluteUrl: returns the site collection url of the current web site.
var siteUrl = _spPageContextInfo.siteAbsoluteUrl

_spPageContextInfo.webAbsoluteUrl: returns the current web site url.
var webUrl = _spPageContextInfo.webAbsoluteUrl

_spPageContextInfo.webServerRelativeUrl: returns the current web relative url
var webRelativeUrl = _spPageContextInfo.webServerRelativeUrl

2. SP.ScriptHelpers: The function implemented in SP.Init.js and used across all scripts. 
SP.ScriptHelpers.isNullOrEmptyString: this method ensure the parameter is null or empty.
var a; if(SP.ScriptHelpers.isNullOrEmptyString(a)) console.log(" empty "); else console.log(" not empty ");

SP.ScriptHelpers.isUndefined: this method ensure the parameter is undefined or defined.
var a; SP.ScriptHelpers.isUndefined(a)? console.log("is undefined"):console.log(a);

SP.ScriptHelpers.urlCombine(a,b): this method usefull to club two url’s. It will take care of ‘/’ forward slash between two urls.
var url = SP.ScriptHelpers.urlCombine(_spPageContextInfo.webAbsoluteUrl,"/_api/web/lists/getbytitle('test')/items")

SP.ScriptHelpers.newGuid(): Generates a new Guid.
Var guid =  SP.ScriptHelpers.newGuid()


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