JS Tips and tricks

js_tipsAndTricks.md

Javascript Tips and Tricks

• Cool stackoverflow post about defining js objects and when to use one.

• Conversion Tricks: http://samuli.hakoniemi.net/

  var myVar   = "3.14159",  
  str     = ""+ myVar,//  to string  
  int     = ~~myVar,  //  to integer  
  float   = 1*myVar,  //  to float  
  bool    = !!myVar,  /*  to boolean - any string with length 
                          and any number except 0 are true */ 

NodeJS specific things

• Create an empty file: http://stackoverflow.com/questions/12809068/create-an-empty-file-in-nodejs

  var fs = require('fs');
  fs.closeSync(fs.openSync(filepath, 'w'));

• Append to a file: http://stackoverflow.com/questions/3459476/how-to-append-to-a-file-in-node

  var fs = require('fs');
  fs.appendFile('message.txt', 'data to append', function (err) {
    //Error handling or other info.
  });

• Delete a file: https://nodejs.org/api/fs.html#fs_file_system

  var fs = require('fs');
  fs.unlink('/tmp/hello', function (err) {
    if (err) throw err;
    console.log('successfully deleted /tmp/hello');
  });