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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,32 +1,20 @@ | ||
| 'use strict' | ||
|
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| /* the readline-sync module allows NodeJS to read input from the terminal. */ | ||
| const readline = require('readline-sync') | ||
|
|
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| /* Here we declare an empty array which will be used to store the todo list items. */ | ||
| var items = [] | ||
| const items = [] | ||
|
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| /* the do-while loop has its exit condition at the end which means it always executes at least once. */ | ||
| do { | ||
| /* We capture the text input by the user. This is then converted into a String and finally any _whitespace_ (newline characters, spaces, etc) are removed. */ | ||
| var input = String(readline.question('enter command: ')).trim() // try switching for a let... or a const... | ||
| /* The indexOf() function looks for the first ocurrance of the supplied string parameter or -1 if it is not found. Notice the use of === to compare the two values, this is a 'strict' comparison and should always be used instead of ==. It checks for equal values and equal type. */ | ||
| var input = String(readline.question('enter command: ')).trim() | ||
| if (input.indexOf('add ') === 0) { | ||
| /* This time the indexOf() function is used to locate the first space character. */ | ||
| let space = input.indexOf(' ') | ||
| /* the substring() function returns the string after the specified position. This will include the space character and so the result is trimmed of any whitespace. */ | ||
| let item = input.substring(space).trim() | ||
| /* console.log() prints to the terminal. */ | ||
| console.log('adding "'+item+'"') | ||
| /* All arrays have a built-in push() function which appends an item to their end. */ | ||
| const space = input.indexOf(' ') | ||
| const item = input.substring(space).trim() | ||
| console.log(`adding "${item}"`) | ||
| items.push(item) | ||
| } | ||
| if (input.indexOf('list') === 0) { | ||
| /* Here we use a for...next loop to interate through all the array indexes. The let keyword defines a variable with _block_ scope (more on this later). */ | ||
| for (let i=0; i< items.length; i++) { | ||
| /* Here we reference the array index. */ | ||
| console.log(i+'. '+items[i]) | ||
| console.log(`${i}. ${items[i]}`) | ||
| } | ||
| } | ||
| /* the code will loop unless the input was _exit_. Notice the use of !== in the comparison instead of the more typical !=. This is a strict negating comparison. This means 'not equal and not equal type' */ | ||
| } while (input !== 'exit') |
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