The given code defines a function called TITLE_CASE that converts a given string str into title case. Title case is a writing style where the first letter of each word is capitalized, and the rest of the letters are in lowercase. The function follows these steps:
It starts by declaring a constant variable words and assigns it the result of manipulating the input string str. The string is first converted to lowercase using the toLowerCase() method to ensure consistency. Then, the split() method is used to split the string into an array of words using the space (' ') as the delimiter. The resulting array of words is stored in the words variable.
The forEach() method is called on the words array, which iterates over each element (word) of the array. For each word, the function executes the provided callback function.
Inside the callback function, the current word is accessed using the ele parameter. The index of the current word in the array is accessed using the ind parameter.
The callback function capitalizes the first letter of each word by using the charAt(0) method to access the first character of the word, converting it to uppercase using the toUpperCase() method, and then concatenating it with the rest of the word. The rest of the word is obtained by slicing the word from the second character onwards using the slice(1) method. The modified word is then assigned back to the words array at the same index (ind).
After iterating through all the words in the words array and modifying them to title case, the function returns the modified words joined back into a single string using the space (' ') as the delimiter. This is done by calling the join(' ') method on the words array.
To understand how this function works, let's consider an example:
TITLE_CASE('hello world')
The input string is 'hello world'.
The toLowerCase() method is applied to the input string, resulting in 'hello world'.
The split(' ') method is applied to the lowercase string, resulting in the words array: ['hello', 'world'].
The forEach() method iterates over each word in the words array.
For the first iteration, the word is 'hello' at index 0.
The first character 'h' is capitalized using charAt(0).toUpperCase(), resulting in 'H'.
The rest of the word 'ello' is obtained using slice(1).
The modified word 'Hello' is assigned back to the words array at index 0.
For the second iteration, the word is 'world' at index 1.
The first character 'w' is capitalized using charAt(0).toUpperCase(), resulting in 'W'.
The rest of the word 'orld' is obtained using slice(1).
The modified word 'World' is assigned back to the words array at index 1.
After modifying all the words, the join(' ') method is called on the words array, resulting in the string 'Hello World'.
The modified string 'Hello World' is returned as the result of the function.
In summary, the TITLE_CASE function converts a given string into title case by converting the string to lowercase, splitting it into an array of words, capitalizing the first letter of each word, and then joining the modified words back into a single string.
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