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Document Object
document.write() Method document.close() Method document.open() Method
Window Object
window.name Property window.length Property window.resizeTo() Method window.resizeBy() Method window.moveTo() Method window.moveBy() Method window.print() Method
Window Object [cont'd]
window.close() Method window.stop() Method window.blur() Method window.focus() Method window.open() Method window.clearTimeout() Method window.clearInterval() Method
Window Object [cont'd]
window.setInterval() Method window.btoa() Method window.atob() Method window.confirm() Method window.prompt() Method window.alert() Method
Math Class
Math.prototype.atan2() Method Math.prototype.atan() Method Math.prototype.acos() Method Math.prototype.asin() Method Math.prototype.tan() Method Math.prototype.cos() Method Math.prototype.sin() Method
Math Class [cont'd]
Math.prototype.exp() Method Math.prototype.sqrt() Method Math.prototype.pow() Method Math.prototype.min() Method Math.prototype.max() Method Math.prototype.floor() Method Math.prototype.ceil() Method
Math Class [cont'd]
Math.prototype.abs() Method Math.prototype.round() Method
Date Class
Date.prototype.toString() Method Date.prototype.toISOString() Method Date.prototype.toTimeString() Method Date.prototype.toDateString() Method Date.prototype.setMilliseconds() Method Date.prototype.setSeconds() Method Date.prototype.setMinutes() Method
Date Class [cont'd]
Date.prototype.setHours() Method Date.prototype.setTime() Method Date.prototype.setFullYear() Method Date.prototype.setMonth() Method Date.prototype.getUTCMilliseconds() Method Date.prototype.getUTCSeconds() Method Date.prototype.getUTCMinutes() Method
Date Class [cont'd]
Date.prototype.getUTCHours() Method Date.prototype.getUTCFullYear() Method Date.prototype.getUTCMonth() Method Date.prototype.getUTCDay() Method Date.prototype.getUTCDate() Method Date.prototype.getTimezoneOffset() Method Date.prototype.getMilliseconds() Method
Date Class [cont'd]
Date.prototype.getSeconds() Method Date.prototype.getMinutes() Method Date.prototype.getHours() Method Date.prototype.getTime() Method Date.prototype.getFullYear() Method Date.prototype.getMonth() Method Date.prototype.getDay() Method
Date Class [cont'd]
Date.prototype.getDate() Method
Number Class
Number.prototype.toExponential() Method Number.prototype.valueOf() Method Number.prototype.toPrecision() Method Number.prototype.toFixed() Method
String Class
String.prototype.length Property String.prototype.toString() Method String.prototype.valueOf() Method String.prototype.toLocaleUpperCase() Method String.prototype.toLocaleLowerCase() Method String.prototype.toUpperCase() Method String.prototype.toLowerCase() Method
String Class [cont'd]
String.prototype.split() Method String.prototype.slice() Method String.prototype.replace() Method String.prototype.match() Method String.prototype.search() Method String.prototype.substring() Method String.prototype.substr() Method
String Class [cont'd]
String.prototype.concat() Method String.prototype.trim() Method String.prototype.lastIndexOf() Method String.prototype.indexOf() Method String.prototype.fromCharCode() Method String.prototype.charCodeAt() Method String.prototype.charAt() Method
String.prototype.substring() Method in String Class of Javascript Syntax with Examples
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Usage 
substring() function used to take specific part of string or character from the main string as like substr().

Note: 
Only difference between these two function -The substring() not include the end position character when it seperate the main string.
Syntax
	string.substring(startPosition,endPosition)
	
	End position is optional,If end position not determined the string taken upto the last character.
Example
var userName = "Abdulkalam";

//without end position
var char1 = userName.substring(2);
document.write("string is "+char1+" .");

//with end position
var char2 = userName.substring(1,6);
document.write("string is "+char2+".");
Output 
string is dulkalam.
string is bdulk.
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