Journey of Software Development
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var add = function(x, y) {
return x + y;
}
var add2 = add(2); // return: function()
add2(10); // return: 12
add2(5); // return: 7
var add = function(x) {
return function(y) {
return x + y;
}
}
var add2 = add(2); // return: function(y) {...}
add2(10); // return: 12
add2(5); // return 7
var add = function(x, y) {
return x + y;
}.autoCurry();
var modulo = function(divisor, dividend) {
return dividend % divisor;
}.autoCurry();
modulo(3, 9); // return: 0
var isOdd = module(2);
isOdd(6); // return: 0
isOdd(7); // return: 1
var filter = function(f, xs) {
return xs.filter(f);
}.autoCurry();
filter(isOdd, [1, 2, 3, 4, 5]); // return: [1, 3, 5]
var getTheOdds = filter(isOdd);
getTheOdds([1, 2, 3, 4, 5]); // return: [1, 3, 5]
var firstTwoLetters = function(words) {
return _.map(words, function(word) {
return _.first(word, 2);
});
};
firstTwoLetters(['jim', 'kate']); // return: ['ji', 'ka']
// _.first(n, array) 參數顛倒
var firstTwoLetters = function(words) {
return _.map(words, _.first(2));
};
// 更進一步, _.map(f, array) 參數顛倒
var firstTwo = _.map(_.first(2));
filterTwo(['jim', 'kate']);
var sortedPhones = function(users) {
return _.chain(users)
.sortBy(function(user) { return user.signup_date; })
.map(function(user) { return user.phone; })
.value();
};
sortedPhones(users);
var sortedPhones = _.compose(
_.map(function(user){ return user.phone; }),
_.sortBy(function(useR){ return user.signup_date}));
sortedPhones(users);
var dot = function(prop, obj) {
return obj[prop];
}.autoCurry();
var sortedPhones = _.compose(_.map(dot('phone')),
_.sortBy(dot('signup_date')));
sortedPhones(users);
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| [圖片來源: www.wowwiki.com] |
