Currying
有時候我們呼叫某個函式，傳入的參數大多數都是一樣，那我們就可以嘗試保留那些重複的參數，而這個過程就是Currying(Curry化)
html:
<!DOCTYPE html>
<html>
<head>
<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.4.0/angular.min.js"></script>
<script src="https://code.jquery.com/jquery-2.0.3.js"></script>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width">
<title>Currying</title>
</head>
<body ng-app="mainApp">
<div class="PageContent">
<div ng-controller="tableCtrl">
<input type="text" ng-model="setData" ng-change="change()">
</div>
</div>
</body>
</html>
javascript:
function currying(fn){
var slice = Array.prototype.slice,
stored_args = slice.call(arguments, 1);
return function(){
var new_args = slice.call(arguments),
args = stored_args.concat(new_args);
return fn.apply(null, args);
};
}
//--angular--//
var mainApp = angular.module('mainApp', []);
mainApp.controller('tableCtrl', ['$scope',function($scope) {
$scope.new_m = currying(function m(x, y){
console.log(x+'*'+y);
return x * y;
}, 5);
$scope.new_m2 = currying(function m(x, y ,z ,k){
console.log(x+'+'+y+'+'+z+'*'+k);
return (x + y + z) * k;
}, 5,2,3);
$scope.change = function() {
console.log('==change start==');
console.log('inp:'+$scope.setData);
console.log('do new_m:');
console.log($scope.new_m($scope.setData));
console.log('do new_m2:');
console.log($scope.new_m2($scope.setData));
console.log('==change end==');
};
}]);
console log: 分別輸入1~4
==change start==
inp:1
do new_m:
5*1
5
do new_m2:
5+2+3*1
10
==change end==
==change start==
inp:2
do new_m:
5*2
10
do new_m2:
5+2+3*2
20
==change end==
==change start==
inp:3
do new_m:
5*3
15
do new_m2:
5+2+3*3
30
==change end==
==change start==
inp:4
do new_m:
5*4
20
do new_m2:
5+2+3*4
40
==change end==