CoffeeScriptで覚えたい文法
15695 ワード
ワイ用のメモや
商の整数値
coffee
a // b
js
Math.floor(a / b)
整数化(切り捨て)
coffee
a // 1
js
Math.floor(a)
累乗
coffee
a ** b
js
Math.pow(a, b)
配列の走査
coffee
for value, key in array
console.log key
console.log value
js
var i, key, len, value;
for (key = i = 0, len = array.length; i < len; key = ++i) {
value = array[key];
console.log(key);
console.log(value);
}
連想配列の走査
coffee
for key, value of hash
console.log key
console.log value
js
var key, value;
for (key in hash) {
value = hash[key];
console.log(key);
console.log(value);
}
配列要素の指定
coffee
a // b
js
Math.floor(a / b)
coffee
a // 1
js
Math.floor(a)
累乗
coffee
a ** b
js
Math.pow(a, b)
配列の走査
coffee
for value, key in array
console.log key
console.log value
js
var i, key, len, value;
for (key = i = 0, len = array.length; i < len; key = ++i) {
value = array[key];
console.log(key);
console.log(value);
}
連想配列の走査
coffee
for key, value of hash
console.log key
console.log value
js
var key, value;
for (key in hash) {
value = hash[key];
console.log(key);
console.log(value);
}
配列要素の指定
coffee
a ** b
js
Math.pow(a, b)
coffee
for value, key in array
console.log key
console.log value
js
var i, key, len, value;
for (key = i = 0, len = array.length; i < len; key = ++i) {
value = array[key];
console.log(key);
console.log(value);
}
連想配列の走査
coffee
for key, value of hash
console.log key
console.log value
js
var key, value;
for (key in hash) {
value = hash[key];
console.log(key);
console.log(value);
}
配列要素の指定
coffee
for key, value of hash
console.log key
console.log value
js
var key, value;
for (key in hash) {
value = hash[key];
console.log(key);
console.log(value);
}
..
は右端を含む
...
は右端を含まない
点の数と意味の覚え方
..
は「近い」ので「含む」。...
は「遠い」ので「含まない」。
(@puriketu99談)
coffee
test = [0,1,2,3,4,5,6,7,8]
ika = test[0..3]
miman = test[0...3]
for i in [0..3]
console.log i
for i in [0...3]
console.log i
js
var i, ika, j, k, miman, test;
test = [0, 1, 2, 3, 4, 5, 6, 7, 8];
ika = test.slice(0, 4);
miman = test.slice(0, 3);
for (i = j = 0; j <= 3; i = ++j) {
console.log(i);
}
for (i = k = 0; k < 3; i = ++k) {
console.log(i);
}
スワップ
coffee
[theBait, theSwitch] = [theSwitch, theBait]
js
ref = [theSwitch, theBait], theBait = ref[0], theSwitch = ref[1];
いらん要素を捨てる
coffee
text = "Every literary critic believes he will
outwit history and have the last word"
[first, ..., last] = text.split " "
js
var first, last, ref, text;
text = "Every literary critic believes he will outwit history and have the last word";
ref = text.split(" "), first = ref[0], last = ref[ref.length - 1];
比較演算子の連結
coffee
healthy = 200 > cholesterol > 60
js
healthy = (200 > cholesterol && cholesterol > 60);
ヒアドキュメント
coffee
[theBait, theSwitch] = [theSwitch, theBait]
js
ref = [theSwitch, theBait], theBait = ref[0], theSwitch = ref[1];
coffee
text = "Every literary critic believes he will
outwit history and have the last word"
[first, ..., last] = text.split " "
js
var first, last, ref, text;
text = "Every literary critic believes he will outwit history and have the last word";
ref = text.split(" "), first = ref[0], last = ref[ref.length - 1];
比較演算子の連結
coffee
healthy = 200 > cholesterol > 60
js
healthy = (200 > cholesterol && cholesterol > 60);
ヒアドキュメント
coffee
healthy = 200 > cholesterol > 60
js
healthy = (200 > cholesterol && cholesterol > 60);
"""
で囲む
インデント入れてよし
coffee
text = """
ora
ora
ora
"""
js
var text;
text = "ora\nora\nora";
Author And Source
この問題について(CoffeeScriptで覚えたい文法), 我々は、より多くの情報をここで見つけました https://qiita.com/rev84/items/e999a70fc5dec4701889著者帰属:元の著者の情報は、元のURLに含まれています。著作権は原作者に属する。
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