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'use strict'; const p = console.log; /** callback(value, key, obj) */ const each = (obj, callback) => { const ret = []; for (const key of Object.keys(obj)) { const value = obj[key]; ret.push(callback(value, key, obj)); } return ret; }; const obj = { 名前: 'taro', 苗字: '田中', age: 27, }; const ret = each(obj, (v, k) => `${k}: ${v}`); ret.forEach((v) => p(v)); |
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名前: taro 苗字: 田中 age: 27 |
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docker run -it -v `pwd`:/tmp node bash -c 'cd tmp; pwd; ls;' |
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#include <stdio.h> int getPivot(int a, int b, int c) { if(a > b){ if(b > c){ return b; }else{ return a > c ? c : a; } }else{ if(a > c){ return a; }else{ return b > c ? c : b; } } } void swap(int* a, int l, int r) { int t = a[l]; a[l] = a[r]; a[r] = t; } void dispArrayInt(int* a, int len) { for(int i=0; i<len; i++){ printf("%d ", a[i]); } printf("\n"); } void quicksort_core(int* a, int len, int left, int right) { if(right <= left) { return; } int l = left; int r = right; int p = getPivot(a[l], a[l+1], a[r]); while(1){ while(a[l] < p){ l++; } while(p < a[r]){ r--; } if(r <= l){ break; } swap(a, l, r); l++; r--; } quicksort_core(a, len, left, l-1); quicksort_core(a, len, r+1, right); } void quicksort(int* a, int len) { int left = 0; int right = len - 1; quicksort_core(a, len, left, right); } int main(void) { int len = 10; int a[] = {9,8,7,6,5,4,3,2,1,0}; dispArrayInt(a, len); quicksort(a, len); dispArrayInt(a, len); } |
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'use strict'; const p = console.log; const functionRunner = ({ func, arg }) => func(arg); const fr = functionRunner; fr({ func: p, arg: fr({ func: (a) => a, arg: fr({ func: (b) => b, arg: 'どうなるかな', }), }), }); |
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どうなるかな |
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import java.util.*; import java.util.stream.*; public class Main { public static void main(String[] args) { Sub.main(args); } } class Sub { public static void main(String[] args) { List<Animal> animals = new ArrayList<>(); animals.add(new Cat(3)); animals.add(new Mike(5)); animals.add(new Dog(7)); var breeder = new Breeder(); breeder.breed(animals); } } class u { public static <T> void pln(T t) { System.out.println(t); } public static <T> void pln() { System.out.println(); } } abstract class Animal { protected int age; protected String voice; public Animal(int age) { this.age = age; } public String toString() { var str = this.voice + "(" + this.age + ")"; return str; } public void cry() { System.out.println(this.toString()); } } class Cat extends Animal { public Cat(int age) { super(age); this.voice = "ニャー"; } } class Mike extends Cat { public Mike(int age) { super(age); this.voice = "ミケニャー"; } } class Dog extends Animal { public Dog(int age) { super(age); this.voice = "ワン"; } } class Breeder { public void breed(List<Animal> animals) { animals.stream().forEach((var animal) -> { System.out.println(animal); }); } } |
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ニャー(3) ミケニャー(5) ワン(7) |
ホストのMain.javaがあるディレクトリで次のコマンドを実行する。
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docker run --rm -v "$PWD":/usr/src/myapp -w /usr/src/myapp \ openjdk:11 bash -c 'javac Main.java; java Main; rm *.class;'; |
