Does javascript have a function to capitalize the first letter?

There is no first letter capitalization function in JavaScript; but you can use slice(), toUpperCase(), toLowerCase() functions and the string splicing character " " to set the first letter capitalization to ensure that the first letter of the string is capitalized , the rest is lowercase.

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

There are no functions with capital letters in javascript.

But we can use 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 first letter character part, and other sub-character parts.

• Use the toUpperCase() method to convert the first letter to uppercase; use toLowerCase() to convert other subcharacters to lowercase.

• Use the " " operator to rejoin the two parts

Implementation code:

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

Improve so that the first character of each word in the string is capitalized

function f(str) {
	var newStr = str.split(" ");
	for (var i = 0; i < newStr.length; i++) {
		newStr[i] = newStr[i].slice(0, 1).toUpperCase() + newStr[i].slice(1).toLowerCase();
	}
	console.log(newStr.join(" "));

}
f("hello World！");

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