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promise-foreach\nVery simple and useful implementation of foreach based on promises for parallel requests. For NodeJS.\n\nWorks great in the browser with [browserify](http://github.com/substack/node-browserify).\n\n### Installation\n`$ npm install promise-foreach`\n\n### Usage\n###### Simple case\n```javascript\nconst promiseForeach = require('promise-foreach')\n\nconst list = [{\n  firstName: 'John',\n  lastName: 'Doe'\n}, {\n  firstName: 'Marie',\n  lastName: 'Doe'\n}]\n\npromiseForeach.each(list,\n  person =\u003e {\n    return `${person.firstName} ${person.lastName}`\n  },\n  (arrResult, person) =\u003e {\n    return {\n      firstName: person.firstName,\n      lastName: person.lastName,\n      fullName: arrResult[0]\n    }\n  },\n  (err, newList) =\u003e {\n    if (err) {\n      console.error(err)\n      return ;\n    }\n    console.log('newList : ', newList)\n  })\n```\n\n###### Complex case\n```javascript\nconst https = require('https');\nconst promiseForeach = require('promise-foreach')\n\nconst list = [{\n  firstName: 'John',\n  lastName: 'Doe',\n  photo_id: 1\n}, {\n  firstName: 'Marie',\n  lastName: 'Doe',\n  photo_id: 2\n}]\n\npromiseForeach.each(list,\n  [\n    person =\u003e {\n      return `${person.firstName} ${person.lastName}`\n    },\n    person =\u003e {\n      return asyncGetPhoto(person.photo_id)\n    }\n  ],\n  (arrResult, person) =\u003e {\n    return {\n      firstName: person.firstName,\n      lastName: person.lastName,\n      fullName: arrResult[0],\n      photo: arrResult[1]\n    }\n  },\n  (err, newList) =\u003e {\n    if (err) {\n      console.error(err)\n      return ;\n    }\n    console.log('newList : ', newList)\n  })\n\nfunction asyncGetPhoto(photo_id) {\n  return new Promise(function (resolve, reject) {\n    var request = https.get('https://jsonplaceholder.typicode.com/photos/' + photo_id, function (response) {\n      var body = []\n      response.on('data', function (chunk) {\n        body.push(chunk)\n      })\n      response.on('end', function () {\n        resolve(JSON.parse(body.join('')))\n      })\n    })\n    request.on('error', function (err) {\n      reject(err)\n    })\n  })\n}\n```\n\n###### Parallel case\n```javascript\nconst https = require('https');\nconst promiseForeach = require('promise-foreach')\n\nconst list = [{\n  firstName: 'John',\n  lastName: 'Doe',\n  photo_id: 1,\n  comment_id: 3\n}, {\n  firstName: 'Marie',\n  lastName: 'Doe',\n  photo_id: 2,\n  comment_id: 4\n}]\n\npromiseForeach.each(list,\n  [\n    person =\u003e {\n      return `${person.firstName} ${person.lastName}`\n    },\n    person =\u003e {\n      return asyncGetPhoto(person.photo_id)\n    },\n    person =\u003e {\n      return asyncGetComment(person.comment_id)\n    }\n  ],\n  (arrResult, person) =\u003e {\n    return {\n      firstName: person.firstName,\n      lastName: person.lastName,\n      fullName: arrResult[0],\n      photo: arrResult[1],\n      comment: arrResult[2]\n    }\n  },\n  (err, newList) =\u003e {\n    if (err) {\n      console.error(err)\n      return ;\n    }\n    console.log('newList : ', newList)\n  })\n\nfunction asyncGetPhoto(photo_id) {\n  return new Promise(function (resolve, reject) {\n    var request = https.get('https://jsonplaceholder.typicode.com/photos/' + photo_id, function (response) {\n      var body = []\n      response.on('data', function (chunk) {\n        body.push(chunk)\n      })\n      response.on('end', function () {\n        setTimeout(function () {\n          resolve(JSON.parse(body.join('')))\n        }, 1000)\n      })\n    })\n    request.on('error', function (err) {\n      reject(err)\n    })\n  })\n}\nfunction asyncGetComment(comment_id) {\n  return new Promise(function (resolve, reject) {\n    var request = https.get('https://jsonplaceholder.typicode.com/comments/' + comment_id, function (response) {\n      var body = []\n      response.on('data', function (chunk) {\n        body.push(chunk)\n      })\n      response.on('end', function () {\n        resolve(JSON.parse(body.join('')))\n      })\n    })\n    request.on('error', function (err) {\n      reject(err)\n    })\n  })\n}\n```\n\n###### Browser case\n`$ browserify -r promise-foreach \u003e modules.js`\n\n```html\n\u003cscript src=\"modules.js\"\u003e\u003c/script\u003e\n\n\u003cscript\u003e\n  const promiseForeach = require('promise-foreach');\n\u003c/script\u003e\n\n\u003cscript\u003e\nconst list = [{\n  firstName: 'John',\n  lastName: 'Doe',\n  photo_id: 1\n}, {\n  firstName: 'Marie',\n  lastName: 'Doe',\n  photo_id: 2\n}]\n\npromiseForeach.each(list,\n  [\n    person =\u003e {\n      return `${person.firstName} ${person.lastName}`\n    },\n    person =\u003e {\n      return asyncGetPhoto(person.photo_id)\n    }\n  ],\n  (arrResult, person) =\u003e {\n    return {\n      firstName: person.firstName,\n      lastName: person.lastName,\n      fullName: arrResult[0],\n      photo: arrResult[1]\n    }\n  },\n  (err, newList) =\u003e {\n    if (err) {\n      console.error(err)\n      return ;\n    }\n    console.log('newList : ', newList)\n  })\n\nfunction asyncGetPhoto(photo_id){\n    return new Promise(function(resolve, reject){\n      var request = new Request('https://jsonplaceholder.typicode.com/photos/' + photo_id,{\n        method: 'GET'\n      })\n      fetch(request).then(function(response){\n        resolve(response.json())\n      })\n      .catch(function(error){\n        reject(error)\n      })\n    })\n  }\n\u003c/script\u003e\n```\n\n### Tests\n\nTo run the package's test, first install the dependencies, then run `npm test`:\n\n```\n$ npm install\n$ npm test\n```\n\n### License\n\nMIT License\n","project_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fsaulsluz%2Fpromise-foreach","html_url":"https://awesome.ecosyste.ms/projects/github.com%2Fsaulsluz%2Fpromise-foreach","lists_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fsaulsluz%2Fpromise-foreach/lists"}