const trim = (string) => {
    let strArr = string.split("");
    let trimedStr = [];
    strArr.forEach((item) => {
      if (item !== " ") {
        trimedStr.push(item);
      }
    });
    return trimedStr.join("");
  };

  console.log("trim", trim("Hello world nice world"));
 // output => trim: Helloworldniceworld

Problem Explanation

Let's break down the problem in simple terms:

You have a piece of code that defines a function called trim. The purpose of this function is to remove all the spaces from a given string. In other words, if you pass a sentence with spaces into this function, it will return the same sentence but with all the spaces removed.

How the Function Works:

1. Splitting the String: The function starts by taking the input string (e.g., "Hello world nice world") and splits it into an array of individual characters. For example, "Hello world" becomes ['H', 'e', 'l', 'l', 'o', ' ', 'w', 'o', 'r', 'l', 'd']...

2. Filtering Out Spaces: The function then goes through each character in the array. If the character is not a space (' '), it adds it to a new array called trimedStr. If it is a space, it simply skips it.

3. Rejoining the Characters: After filtering out the spaces, the function takes the remaining characters and joins them back together into a single string without any spaces.

4. Returning the Result: Finally, the function returns the new string that has no spaces.