Javascript Practice 21: JS Hero - String: charAt()

 

Question: 

 

Write a function shortcut that takes two strings and returns the initial letters of theses strings.

Example: shortcut('Amnesty', 'International') should return 'AI'.

 

 

 

 

Answer: 

 

function shortcut (str1, str2) {

return str1.charAt(0)+str2.charAt(0);

};
 

or 

 

function shortcut (str1, str2) {

return str1[0] + str2[0];

};

 

or 

 

function shortcut (str1, str2) {

return str1.charAt()+str2.charAt();

}; 
 

> all answers will work and will return the same output for the above question

> the first example uses the charAt method which returns a new string that consists of the first character of the index which is 0. 

> characters in a string are indexed from left to right

> index of the first character is 0

> 0 is enclosed in round brackets

> the second example does not use the charAt method 

> in the second example, we treat the string like an array object 

> individual characters in an array correspond to a numerical index

> in this case we use 0 enclosed in square brackets 

> the third example is similar to the first one

> the only difference is that we do not provide any index number like 0,1 or 2 etc

> if no index number is provided to charAt method then the default value is 0. 

> function name is shortcut

> it is a function expression

> 2 parameters: str1 & str2

> in all three examples we concatenate the parameters using the '+' sign