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POExplanation of a function that gets letter from word
 

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  1. POExplanation of a function that gets letter from word
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    <p>I'm making a hangman game in javascript, and I'm having trouble understanding the code in this one function.</p> <p>Here is the function:</p> <pre><code>function getLetter(word,letter,display){ // This method is called by the Hangman program when your isLetterInWord function // above returns true. // The parameters passed in are the guessed letter, the secret word, // and the current display state of the secret word. // This method will return a new display state of the secret word based on the matching letter. // REPLACE THIS CODE WITH YOUR getLetter() METHOD while (word.search(letter) != -1) { var index=word.search(letter) display = display.substr(0, index) + letter + display.substr(index + 1); word = word.substr(0, index) + '-' + word.substr(index + 1); } return display; } </code></pre> <p>The part I don't really understand:</p> <pre><code>display = display.substr(0, index) + letter + display.substr(index + 1); word = word.substr(0, index) + '-' + word.substr(index + 1); </code></pre> <p>Basically this program takes a word, find the number of letters and replaces them with hyphens. For example the word 'boat' would be turned to '----'</p> <p>The the job of the function above is to replace the letter guess (correctly) with the corresponding hyphen.</p> <p>Here is the background code for the whole project.</p> <pre><code>// Hangman Project //RETURN A 'HIDDEN' VERSION OF THE SUPPLIED SECRET WORD function getDisplay(word) { // Given a string, "word", return a hidden version of it consisting // of dashes for the display. // REPLACE THIS CODE WITH YOUR getDisplay() METHOD var disp=""; for (var i=0; i &lt; word.length; i++ ){ disp = disp +'-'; } return disp; } //FIND IF THE LETTER IS IN THE WORD function isLetterInWord(word,letter){ // Given the word "word", check if it contains the letter "letter". // REPLACE THIS CODE WITH YOUR isLetterInWord() METHOD if(word.search(letter) != -1) { return true; } else { return false; } } </code></pre> <p>Any help explaining those two lanes would be appreciated. Thanks.</p>
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    1. USBradley Mitchell
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    1. COMDN might be helpful, understanding [`search`](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/search) and [`substr`](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/substr) will help you to understand the whole code.
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      1. POExplanation of a function that gets letter from word
      1. USTeemu
    2. COhow can you have trouble understanding code you are making?
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      1. POExplanation of a function that gets letter from word
      1. USdandavis
    3. CO@dandavis obviously its not his, probably some hangman library he found on the net.
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      1. POExplanation of a function that gets letter from word
      1. USPatrick Evans
 

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