firstdoit’s gists

firstdoit / underscore-2.8.js

Created May 25, 2016

      
        _.chain(students)
      
        .filter(isApproved)
      
        .pluck('grades')
      
        .flatten()
      
        .min() // Can you guess what this does?
      
        .value()
      
        // 6

firstdoit / underscore-2.7.js

Created May 25, 2016

View underscore-2.7.js

      
        _.every(studentsByClass["A"], isApproved) // false
      
        _.every(studentsByClass["B"], isApproved) // true

firstdoit / underscore-2.6.js

Last active May 25, 2016

View underscore-2.6.js

      
        var studentGrades = _.pluck(studentsByClass["A"], 'grades')
      
        // [[7.0, 6.9, 8.0], [5.0, 8.7, 3.7]] - not very useful
      
        var grades = _.flatten(studentGrades)
      
        // [7.0, 6.9, 8.0, 5.0, 8.7, 3.7]
      
        average(grades)
      
        // 6.55

firstdoit / underscore-2.5.js

Created May 25, 2016

View underscore-2.5.js

      
        var studentsByClass = _.groupBy(students, 'class')
      
        // Same result! Neat.

firstdoit / underscore-2.4.js

Created May 25, 2016

View underscore-2.4.js

      
        var studentsByClass = _.groupBy(students, function (student) { return student.class })
      
        /* {
      
          "A": [
      
            { name: "John", grades: [7.0, 6.9, 8.0], class: "A" },
      
            { name: "Paul", grades: [5.0, 8.7, 3.7], class: "A" }
      
          ],
      
          "B": [
      
            { name: "Luke", grades: [9.0, 8.2, 6.2], class: "B" },
      
            { name: "Mark", grades: [6.0, 9.0, 8.4], class: "B" }
      
          ]

firstdoit / underscore-2.3.js

Created May 25, 2016

View underscore-2.3.js

      
        _.pluck(approvedStudents, 'name')
      
        // ["John", "Luke", "Mark"]

firstdoit / underscore-2.2.js

Created May 25, 2016

View underscore-2.2.js

      
        var approvedStudents = _.filter(students, isApproved)
      
        _.map(approvedStudents, function (s) { return s.name })
      
        // ["John", "Luke", "Mark"]

firstdoit / underscore-2.1.js

Created May 25, 2016

View underscore-2.1.js

      
        var students = [
      
          { name: "John", grades: [7.0, 6.9, 8.0], class: "A" },
      
          { name: "Paul", grades: [5.0, 8.7, 3.7], class: "A" },
      
          { name: "Luke", grades: [9.0, 8.2, 6.2], class: "B" },
      
          { name: "Mark", grades: [6.0, 9.0, 8.4], class: "B" }
      
        ];
      
        var sum = function (numbers) { return _.reduce(numbers, function (sum, n) { return sum + n }, 0) }
      
        var average = function (numbers) { return sum(numbers) / numbers.length }
      
        var isApproved = function (student) { return average(student.grades) >= 7 }

firstdoit / why-doesnt-this-work.js

Created Mar 20, 2016

View why-doesnt-this-work.js

      
        import React from 'react'
      
        // https://github.com/gaearon/babel-plugin-react-transform/issues/57
      
        export default function wrapFunctionalComponent (fc) {
      
          return React.createClass({
      
            displayName: fc.Name,
      
            render() {
      
              return fc.apply(null, this.props)
      
            }

firstdoit / underscore-1.6.js

Last active Mar 13, 2016

View underscore-1.6.js

      
        var array = [{name: "Foo", points: 1}, {name: "Bar", points: 3}];
      
        var initial = 0;
      
        var totalPoints = function (result, player) {
      
          return result + player.points;
      
        };
      
        var total = _.reduce(array, totalPoints, initial);
      
        console.log(total) // 4

Guilherme Rodrigues firstdoit