It is now available with the latest PM2 version:

{ 
  apps : [{
    name : 'API',
    script : 'api.js',
    interpreter : 'node@6.9.1'
 }]
}

https://github.com/Unitech/pm2/blob/master/test/fixtures/nvm-node-version/ecosystem.json#L12

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const result = _.map({a: 1, b: 2}, function(value, key) {
    return value + key;
});

Since nobody has added the obvious solution yet which works fine for two comparisons, I'll offer it:

if (foobar == foo || foobar == bar) {
     //do something
}

And, if you have lots of values, then I'd suggest making a Set as this makes very clean and simple comparison code and it's fast at runtime:

// pre-construct the Set
var tSet = new Set([foo, bar, test1, test2, test3]);

// test the Set at runtime
if (tSet.has(foobar)) {
    // do something
}

For pre-ES6, you can get a Set polyfill of which there are many. One is described in this other answer.

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Mike Bostock’s Block 3808218

Jane Pong’s Block 9b9e606e9876e34385cc4aeab188ed73

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You can use environment variable.
For example:

1) NODE_PORT=3002 pm2 start -I 0 app.js

2) Read value in app:

console.log(process.env.NODE_PORT);

Or, if you are build express app:

1) PORT=3002 pm2 start -I 0 ./bin/www

2) Express load PORT automatically at start application.

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