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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.charAt() Method in String Class of Javascript Syntax with Examples
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Usage 
charAt(int index) returns character at the index position of the string.
Syntax 
String.charAt(int index);

index - specify which position character needs to take from the string. index is starting from zero.
Example
var userName = "gopalakrishnan";

//Returns chartacter at 2 index which means `p`.
var charAt2 = userName.charAt(2);
document.write("character is "+charAt2+" at 2.");

//No characters at 54 index So returns empty character
var charAt54 = userName.charAt(54);
document.write("character is "+charAt54+" at 54.");
Output 
Character is p at 2.
Character is at 54.
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