How to capitalize the last letter in JavaScript

Method: 1. Use the slice() method to divide the string into two parts: "last letter" and "other subcharacters"; 2. Use toUpperCase() to convert the last letter to uppercase, toLowerCase() Convert other subcharacters to lowercase; 3. Use the " " operator to rejoin the two parts to form a new string.

The operating environment of this tutorial: windows7 system, javascript version 1.8.5, Dell G3 computer.

In JavaScript, you can use the slice(), toUpperCase(), toLowerCase() functions and the string splicing character " " to set the first letter to be capitalized.

Implementation idea:

• Use the slice() method to divide the string into two parts: the last letter character part, and other sub-character parts.

• Use toUpperCase() method to convert the last letter to uppercase; use toLowerCase() to convert other sub-characters to lowercase.

• Use the " " operator to rejoin the two parts

Implementation code:

function f(str) {
newStr =  str.slice(0,-1).toLowerCase()+str.slice(-1).toUpperCase();
   console.log(newStr);
}
f("hello World");
f("abcd");

Description:

slice(start, end) method can extract a certain part of the string and return the extracted part as a new string.

Use the start (inclusive) and end (exclusive) parameters to specify the part of the string to extract.

Grammar:

string.slice(start,end)

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