Javascript snippets

Posting more for self reference but hopefully it'll be useful for others too. :)


Left-pad string with character 'c':
String.prototype.padZero= function(len, c){
    var s= this, c= c || '0';
    while(s.length< len) s= c+ s;
    return s;
}
(Credit: kennebec from stackoverflow: convert '1' to '0001' in JavaScript.)


Convert numbers between different bases (built in Javascript function):
parseInt(<number>, <baseFrom>).toString(<baseTo>)

Examples: 
parseInt("12", 10).toString(16); // returns "c"
parseInt("1011", 2).toString(10); // returns 11
(Credit: faisalman from GitHubGist: baseConverter.js.)

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