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                            const add = (x) => x + 1;
const mul = (x) => x * 3;
const div = (x) => x / 2;
div(mul(add(add(0)))); //=>3


compose(div, mul, add, add)

把類似于f(g(h(x)))這種寫法簡化成compose(f, g, h)(x)
```js


const add = (x) => x + 1
const add2 = x => x + 2
const add3 = x => x + 3

function compose(...funcs) {
  return function (val) {
    return funcs.reverse().reduce((pre, cur, index, arr) => {
      return cur(pre)
    }, val)
  }
}

let result = compose(add)(5);
console.log(result); // 11



```
                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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