CODEWITHSUNDEEP
javascriptnode.jsasynchronous
BaltoStar
BaltoStar

Reputation: 8977

node.js async.maplimit() pass extra param to processing function

async.eachLimit(rowset.rows, 200, storeRow, postProcessingFunction);

function storeRow(row, cb) {...}

How to pass an additional param to storeRow() ?

So something like this : 

async.eachLimit(rowset.rows, 200, storeRow, rowset.param, postProcessingFunction);

function storeRow(row, param, cb) {...}

Upvotes: 1

Views: 477

Answers (2)

Rob Raisch
Rob Raisch

Reputation: 17357

Use Function.bind to create a "curried" function.

function storeRow(propertyFromRowset, row, cb){ /* ... */ };

async.eachLimit(
  rowset.rows,
  200,
  storeRow.bind(null,rowset.property),
  postProcessingFunction
);

See Wikipedia:Currying for the theory and Function.prototype.bind for details of how to curry a function in Javascript.

Upvotes: 0

cybersam
cybersam

Reputation: 66989

You probably don't need to do it that way. Instead, you could do something like this:

function foo(param) {
  async.eachLimit(rowset, 200, storeRow, postProcessingFunction);
  function storeRow(row, cb) { /* this code uses param */ }
}

Upvotes: 1

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