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- function adder() {
- return [].slice.call(arguments).reduce((a,b) => a + b);
- // return [...arguments].reduce((a,b) => a + b)
- }
- let fn = adder;
- fn = fn.bind(null, 1);
- fn = fn.bind(null, 2,3,4,5)
- console.log(fn()) // 15
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