Question:What is the difference between substring() and substr()? 

Answer Both substring() and substr() functions are used to extract a fragment of a string but  they perform the task in a different way. such as substring() enters the beginning and ending numeric positions of a part of the string to  extract, whereas the substr() specifies the position of the first character of the string  and number of characters to extract.
Example:
1.var str="Bangladesh";
var res=str.substring(6,10);
The result of res will be 'desh'.
2.var st="JavaScript"; 
var res=str.substr(4,6);
The result of res will be 'Script'. 

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