Background
Let us continue with our task of seeing how repeatChar is coded in various languages.
In this post, we will use JavaScript.
Specifically, NodeJS.
Code
Outline
- Function:-repeatChar ( char ch, int numberofChars)
- Declare Variables
- buffer as an array ( var buffer = [] )
- Validate Arguments
- ch
- Check if ch is a string
- numberofChars
- Check if numberofChars is a number
- ch
- Utilize Loop
- Set buffer’s character on each array position to argument ch
- Issue Join Method against character array; separating array characters with empty character
- .join(”)
- Declare Variables
Script
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| /* | |
| Function:- repeatChar | |
| */ | |
| function repeatChar(ch, count) | |
| { | |
| /* | |
| Declare buffer as an array | |
| */ | |
| var buffer = []; | |
| var str = ""; | |
| var i = 0; | |
| var log = ""; | |
| const parameterTypeChExpected = "string"; | |
| const parameterTypeCountExpected = "number"; | |
| /* | |
| Check type of parameter ch | |
| */ | |
| if ( typeof(ch) != parameterTypeChExpected) | |
| { | |
| log = "Parameter ch is expected to be of type " + parameterTypeChExpected; | |
| log = log + ". " + "Unfortunately ch is of type " + typeof(ch); | |
| throw new Error(log); | |
| } | |
| /* | |
| Check type of parameter count | |
| */ | |
| if ( typeof(count) != parameterTypeCountExpected) | |
| { | |
| log = "Parameter count is expected to be of type " + parameterTypeCountExpected; | |
| log = log + ". " + "Unfortunately count is of type " + typeof(count); | |
| throw new Error(log); | |
| } | |
| /* | |
| Start from 0 to count-1 | |
| Incrementing by 1 | |
| */ | |
| for(i=0; i < count;i++) | |
| { | |
| buffer[i] = ch; | |
| } | |
| /* | |
| Join each array element separating by empty string | |
| */ | |
| str = buffer.join(''); | |
| return (str); | |
| } | |
| /* | |
| Function:- repeatCharUsingFill | |
| */ | |
| function repeatCharUsingFill(ch, count) | |
| { | |
| /* | |
| Declare buffer as an array | |
| */ | |
| var buffer = []; | |
| var i = 0; | |
| var log = ""; | |
| const parameterTypeChExpected = "string"; | |
| const parameterTypeCountExpected = "number"; | |
| /* | |
| Check type of parameter ch | |
| */ | |
| if ( typeof(ch) != parameterTypeChExpected) | |
| { | |
| log = "Parameter ch is expected to be of type " + parameterTypeChExpected; | |
| log = log + ". " + "Unfortunately ch is of type " + typeof(ch); | |
| throw new Error(log); | |
| } | |
| /* | |
| Check type of parameter count | |
| */ | |
| if ( typeof(count) != parameterTypeCountExpected) | |
| { | |
| log = "Parameter count is expected to be of type " + parameterTypeCountExpected; | |
| log = log + ". " + "Unfortunately count is of type " + typeof(count); | |
| throw new Error(log); | |
| } | |
| /* | |
| Allocate memory | |
| */ | |
| buffer = new Array(count); | |
| /* | |
| Check allocated object | |
| */ | |
| if ( (buffer === undefined || buffer === null) ) | |
| { | |
| log = "Was not able to allocate memory in repeatCharUsingFill"; | |
| log = log + ". " + "requested memory of byte size " + count; | |
| throw new Error(log); | |
| } | |
| /* | |
| Set buffer to char ( ch ) | |
| */ | |
| buffer.fill(ch); | |
| /* | |
| Join each array element separating by empty string | |
| */ | |
| str = buffer.join(''); | |
| return (str); | |
| } | |
| /* | |
| Get the character | |
| */ | |
| const chSeparator = '='; | |
| /* | |
| Get phrase | |
| */ | |
| phrase = 'Head of the class'; | |
| /* | |
| Get the length of the phrase | |
| */ | |
| len = phrase.length; | |
| /* | |
| Repeat Character | |
| */ | |
| filler = repeatChar( chSeparator, len); | |
| /* | |
| Repeat Character Using Fill Method | |
| */ | |
| filler2 = repeatCharUsingFill(chSeparator, len); | |
| /* | |
| Display Phrase | |
| */ | |
| console.log( phrase ); | |
| /* | |
| Display Filler | |
| */ | |
| console.log ( filler ) ; | |
| console.log ( filler2 ) ; |
Coding Tools
Online Compiler
Here are the online tools that we used to code the script:-
- TutorialsPoint ( https://www.tutorialspoint.com/ )
- CodingGrounds
- Coding Rooms
- JavaScript ( https://www.codingrooms.com/compiler/javascript )
Source Code Control
repeatChars
GitLab
GitHub
- NodeJS
Link
Learning in the Open 