Trying to understand chained methods, either like math or cheerio/jQuery, when things get too long I shorten and replace with my own methods.
//这将帮助我在复杂的方法中获得缩短的方法，并应用于项目
function getValue() {
this.add = function(y) {
return x + y;
};
this.mult = function(y) {
return x * y;
};
return this;
};
//不使用new操作符的实例会很有趣
const price1 = getValue(8);
const price2 = getValue(2).add(1);
const price3 = getValue(5).add(3).mult(2);
//不重要，但是推进更远：
const price4 = getValue().add(2).add(2);
const price5 = getValue(5).add(2).add(2);
console.log(price1); // 期望值为8
console.log(price2); // 期望值为3
console.log(price3); // 期望值为16
console.log(price4); // 期望值为4
console.log(price5); // 期望值为9
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I improved the above code by adding a default value for y to prevent the result from being "nan" when y is not provided. Overall, this is a great answer.
function getValue(x = 0) { this.x = x; this.add = function(y = 0) { this.x += y; return this; }; this.mult = function(y = 1) { this.x *= y; return this; }; this.value = function() { return this.x; }; return this; }; const price1 = getValue(8).value(); const price2 = getValue(2).add(1).value(); const price3 = getValue(5).add(3).mult(2).value(); const price4 = getValue().add(2).add(2).value(); const price5 = getValue(5).add(2).add(2).value(); console.log(price1); // 期望输出 8 console.log(price2); // 期望输出 3 console.log(price3); // 期望输出 16 console.log(price4); // 期望输出 4 console.log(price5); // 期望输出 9You need to use the
getValuefunction to receive a parameterx. Additionally, your chained functions should returnthis. Finally, you need a function to unpack the value, i.e.value().Please note that in
price4, you do not pass in the initial value, so it can default to0.function getValue(x = 0) { this.x = x; this.add = function(y) { this.x += y; return this; }; this.mult = function(y) { this.x *= y; return this; }; this.value = function() { return this.x; }; return this; }; const price1 = getValue(8).value(); const price2 = getValue(2).add(1).value(); const price3 = getValue(5).add(3).mult(2).value(); const price4 = getValue().add(2).add(2).value(); const price5 = getValue(5).add(2).add(2).value(); console.log(price1); // 期望值为 8 console.log(price2); // 期望值为 3 console.log(price3); // 期望值为 16 console.log(price4); // 期望值为 4 console.log(price5); // 期望值为 9