chainbuilder-save

A chainbuilder mixin for saving/restoring values.

Installation npm install chainbuilder chainbuilder-save --save

Usage

var chainBuilder = require('chainbuilder');

var myChain = chainBuilder({
  methods: {/* ... your methods ... */},
  mixins: [
    /* ... other mixins ... */
    require('chainbuilder-save')()
  ]
});

Example

myChain(2)
  .plus(1)
  .save('var1')           // Saves 3 to 'var1'
  .plus(5)
  .save('var2')           // Save 8 to 'var2'
  .injectSaved('var1')    // Value in the chain is now 3
  .plus(1)
  .end(function (err, result) {
    console.log(result);                // > 4
    console.log(this.getSaved('var1')); // > 3
    console.log(this.getSaved('var2')); // > 8
  });

Methods

require('chainbuilder-save')()

Init the mixin.

save(varName)

Save the previous result.

@param {String} varName a name for the variable (re-using a name will override the value).

injectSaved(varName)

Inject the saved value back into the chain.

@param {String} varName name of the variable to restore.

this.getSaved(varName) context method

Get a saved value from within a chainbuilder context (e.g. a tap, transform or end callback).

@param {String} varName name of the variable to get.