I'm new to JavaScript and am having a bit of trouble with this problem:
Construct a function called titleCase that takes a sentence string and gives it title casing.
titleCase("this is an example") // Should return "This Is An Example"
titleCase("test") // Should return "Test"
titleCase("i r cool") // Should return "I R Cool"
titleCase("WHAT HAPPENS HERE") // Should return "What Happens Here"
titleCase("") // Should return ""
titleCase("A") // Should return "A"
This is the code I've tried:
const titleCase = function(text) {
text = text.split(' ');
for (let i = 0; i < text.length; i++) {
text[i] = text[i].toLowerCase().split('');
text[i][0] = text[i][0].toUpperCase();
text[i] = text[i].join('');
}
if (text === "") {
return ""
}
return text.join(' ');
}
It is passing all tests except for the empty string "" test.
You will need to move:
if (text === "") {
return ""
}
to the first line of the function.
Here is a straightforward solution:
function titleCase(s){
let r="";
for (let i=0; i<s.length; i++) r+=(i==0 || s[i-1]==" ")?s[i].toUpperCase():s[i].toLowerCase();
return r;
}
console.log(titleCase("helLo tHERE!"));
console.log(titleCase("this is an example")); //should return "This Is An Example"
console.log(titleCase("test")); //should return "Test"
console.log(titleCase("i r cool")); //should return "I R Cool"
console.log(titleCase("WHAT HAPPENS HERE")); //should return "What Happens Here"
console.log(titleCase("")); //should return ""
console.log(titleCase("A")); //should return "A"You just have to declare text empty as default in the function and add the if (text === "") { condition before the for loop. So if the text is empty then before executing the for loop it will return "". Please check the following snippet:
const titleCase = function(text = '') {
if (text === "") {
return ""
}
text = text.split(' ');
for (let i = 0; i < text.length; i++) {
text[i] = text[i].toLowerCase().split('');
text[i][0] = text[i][0].toUpperCase();
text[i] = text[i].join('');
}
return text.join(' ');
}
console.log(titleCase());
console.log(titleCase("Hello"));
console.log(titleCase("Hello World"));You can’t modify a character with the [] notation.
To replace the first character of a string, don't do
str[0] = str[0].toUppercase()
but
str = "X" + str.substr(1)
Your function can be:
function titleCase(str) {
return str.toLowerCase().replace(/(^|\s)[a-z]/g, (a)=>a.toUpperCase());
}
This function will:
[a-z]) following a space (\s) or the beginning of the string (^) with its uppercase version.