Make RGB Colors Lighter / Darker

example.js

/*
 * Make RGB-Colors lighter / darker
 */

var color = function(c,n,i,d){for(i=3;i--;c[i]=d<0?0:d>255?255:d|0)d=c[i]+n;return c}

/**
 * @param array RGB Colors
 * @param number Amount
 */
color( [225, 100, 10 ], -90 ); // returns [135,10,0]
color( [225, 100, 10 ], 70 ); // returns [255,170,80]

index.js

function(c,n,i,d){for(i=3;i--;c[i]=d<0?0:d>255?255:d|0)d=c[i]+n;return c}

package.json

{
  "name": "darker color",
  "keywords": [ "color", "darker", "lighter" ]
}

Nice one! We're all still waiting for a wolf140b...

Wolf140b? You sir have no idea what you just unleashed.

Save 1 byte? I'm not sure if this works in all web browsers but I think so.

function(c,n,i,d){for(i in c)d=c[i]+n,c[i]=d<0?0:d>255?255:d|0;return c}

ES5 version, saves 1 byte:

function(c,n){return c.map(function(d){return(d+=n)<0?0:d>255?255:d|0})}

ES6 version, saves 32 byte:

(c,n)=>c.map(d=>(d+=n)<0?0:d>255?255:d|0)