技術情報

2019年12月12日
技術情報

CakePHP Windows10環境構築ガイド

CakePHPフレームワークをWindows10で使用する際の環境構築ガイドです。

nishida at 2019年12月12日 10:00:54

2019年12月06日
技術情報

Lodash Js Array & Object – Part 3 (Final)

Today I will talk about dealing with array and object in Lodash Js.

Filter

Filtering a list to transform the elements we want to get back

var numbers = _.range(0,10);      // [0, 1, 2, 3, 4, 5, 6, 7, 8, 9]

var evenNumbers = _.filter(numbers, function(e){ return e % 2 != 0; });
// evenNumbers is now [ 0, 2, 4, 6, 8 ]

var numbers = _.range(0,10); // [0, 1, 2, 3, 4, 5, 6, 7, 8, 9]

var evenNumbers = _.filter(numbers, function(e){ return e % 2 != 0; });

// evenNumbers is now [ 0, 2, 4, 6, 8 ]

Reduce

Reducing a list of objects to a single value.
Ex=>A group of people can buy a meal or not. In that case we have to check out they have the enough amount by the sum of money they have.
(Each’s money => sum money)

var ppl = [
    {
        'name': 'Keita',
        'money': 1000
    },
    {
        'name': 'Sato',
        'money': 3000
    },
    {
        'name': 'Ruma',
        'money': 500
    },
]

var sumMoney = function(data){
    return _.reduce(
        data,
        function(accumulated, e){
            return accumulated + e.money;
        },
        0
    );
}

function canBuyMeal(data){
    return 3500 < sumMoney(data);
}

canBuyMeal(ppl);    // returns true

var ppl = [

{

'name': 'Keita',

'money': 1000

{

'name': 'Sato',

'money': 3000

{

'name': 'Ruma',

'money': 500

]

var sumMoney = function(data){

return _.reduce(

data,

function(accumulated, e){

return accumulated + e.money;

);

}

function canBuyMeal(data){

return 3500 < sumMoney(data);

}

canBuyMeal(ppl); // returns true

Some

If there is at least one record in a collection that meets some criteria.

var ppl = [
    {
        'name': 'Keita',
        'hasMoney': true
    },
    {
        'name': 'Sato',
        'hasMoney': false
    },
    {
        'name': 'Ruma',
        'hasProperty': true
    },
]

function canLive(data){
    return _.some(data, function(e){ return e.hasProperty; });
}

canGroupDrive(ppl);    // returns true

var ppl = [

{

'name': 'Keita',

'hasMoney': true

{

'name': 'Sato',

'hasMoney': false

{

'name': 'Ruma',

'hasProperty': true

]

function canLive(data){

return _.some(data, function(e){ return e.hasProperty; });

}

canGroupDrive(ppl); // returns true

Map

Useful for changing a list into a different list in a purely declarative way.
Can just specify how you want to manipulate an element of a list.
Make a new list transformed by providing a function

var res1 = _.range(5);       // [ 0, 1, 2, 3, 4]

var res2 = _.map(a, function(e){ return e + e;} );

//result is [0, 2, 4, 6, 8]

var res1 = _.range(5); // [ 0, 1, 2, 3, 4]

var res2 = _.map(a, function(e){ return e + e;} );

//result is [0, 2, 4, 6, 8]

By Yuuma

yuuma at 2019年12月06日 11:00:39

2019年12月05日
技術情報

[php] printf sprintf vprintf vsprintf　の違いについて（その2）

PHPでフォーマットした文字列の出力をおこなう際に使用する関数、
printf sprintf vprintf vsprintf　の使い分けについて記載します。

nishida at 2019年12月05日 10:00:45

2019年11月29日
技術情報

Lodash Js Part 2(Chaining and has method)

Today I will talk about chaining functions and has method.

Chaining

Without Chaining

var data1 = [10, 15, 20, 25, 15];

var data2 = _.filter(data1, function(item){ return item % 10 === 5 });
// data2 now contains [15, 25, 15]

var data3 = _.uniq(data2);
// data3 now contains [15, 25]

var data4 = _.map(data3, function(item){ return item + 1 });
// data4 now contains [16, 26]

var data1 = [10, 15, 20, 25, 15];

var data2 = _.filter(data1, function(item){ return item % 10 === 5 });

// data2 now contains [15, 25, 15]

var data3 = _.uniq(data2);

// data3 now contains [15, 25]

var data4 = _.map(data3, function(item){ return item + 1 });

// data4 now contains [16, 26]

With Chaining

var data1 = [10, 15, 20, 25, 15];

var data4 = _(data1)
    .filter(function(item){ return item % 10 === 5 })
    .uniq()
    .map(function(item){ return item + 1 })
    .value();
// data4 now contains [16, 26]

var data1 = [10, 15, 20, 25, 15];

var data4 = _(data1)

.filter(function(item){ return item % 10 === 5 })

.uniq()

.map(function(item){ return item + 1 })

.value();

// data4 now contains [16, 26]

The chaining is more efficient.
no intermediate results are created.

Slight Changes for `Explicit Chain` & `Implicit Chain`

Explicit chaining

Still need to unwrap the result with .value().

var data = [1, 5, 10, 15, 5, 10, 1, 20];

var unqSum = _.chain(data)
   .uniq()
   .sum()       
   .value();   
result is 51

var data = [1, 5, 10, 15, 5, 10, 1, 20];

var unqSum = _.chain(data)

.uniq()

.sum()

.value();

result is 51

Implicit chaining

The “unwrapping” of the single value is implied. (there is no need to call .value().)

var data = [1, 5, 10, 15, 5, 10, 1, 20];

var unqSum = _(data)
    .uniq()
    .sum();  
    
    //result is 51

var data = [1, 5, 10, 15, 5, 10, 1, 20];

var unqSum = _(data)

.uniq()

.sum();

//result is 51

has

Determine if an object has (or contains) a key.

var obj = {
  data1: 2,
  data2: 3,
  data3: {
    data3_1:40,
    data3_2:{
      data3_2_1:500
    }
  }
};

var res1 = _.has(obj, "data1");          // true
var res2 = _.has(obj, "data1.data2");        // false
var res3 = _.has(obj, "data3");          // true
var res4 = _.has(obj, "data3.data3_2");       // true
var res5 = _.has(obj, "data3.res3_2_1");      // false
var res6 = _.has(obj, "data3.data3_1.data3_2_1");   // false
var res7 = _.has(obj, "data3.data3_2.data3_2_1");   // true

var obj = {

data1: 2,

data2: 3,

data3: {

data3_1:40,

data3_2:{

data3_2_1:500

}

};

var res1 = _.has(obj, "data1"); // true

var res2 = _.has(obj, "data1.data2"); // false

var res3 = _.has(obj, "data3"); // true

var res4 = _.has(obj, "data3.data3_2"); // true

var res5 = _.has(obj, "data3.res3_2_1"); // false

var res6 = _.has(obj, "data3.data3_1.data3_2_1"); // false

var res7 = _.has(obj, "data3.data3_2.data3_2_1"); // true

Arrays can be used to split up parts.

var res8 = _.has(obj, ["data1", "data2"]);   // false, same as res2
var res9 = _.has(obj, ["data3", "data3_2"]);  // true, same as res4

1 2	var res8 = _.has(obj, ["data1", "data2"]); // false, same as res2 var res9 = _.has(obj, ["data3", "data3_2"]); // true, same as res4

By Yuuma

yuuma at 2019年11月29日 11:00:07

2019年11月28日
技術情報

[php] printf sprintf vprintf vsprintf　の違いについて（その1）

PHPでフォーマットした文字列の出力をおこなう際に使用する関数、
printf sprintf vprintf vsprintf　の使い分けについて記載します。

nishida at 2019年11月28日 10:00:45

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技術情報

CakePHP Windows10環境構築ガイド

Lodash Js Array & Object – Part 3 (Final)

Filter

Reduce

Some

Map

[php] printf sprintf vprintf vsprintf　の違いについて（その2）

Lodash Js Part 2(Chaining and has method)

Chaining

Without Chaining

With Chaining

Slight Changes for `Explicit Chain` & `Implicit Chain`

Explicit chaining

Still need to unwrap the result with .value().

Implicit chaining

The “unwrapping” of the single value is implied. (there is no need to call .value().)

has

[php] printf sprintf vprintf vsprintf　の違いについて（その1）

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アプリ関連ニュース

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開発スタッフがアプリ関連の最新技術やニュースをご紹介します。

お問い合わせ

技術情報

Filter

Reduce

Some

Map

Chaining

Without Chaining

With Chaining

Slight Changes for Explicit Chain & Implicit Chain

Explicit chaining

Still need to unwrap the result with .value().

Implicit chaining

The “unwrapping” of the single value is implied. (there is no need to call .value().)

has

お問い合わせはこちら

Slight Changes for `Explicit Chain` & `Implicit Chain`