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JavaScript で for/while 文を使わないで1から10までの合計を求める方法(node-fibの真似編)- 合計をもとめる数を指定して、実行時間を測れるようにした
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var calc = function(n, callback) { | |
var sum = function(i, res) { | |
var func = (n>i) ? sum_tick : function(j,k) {callback(k);}; | |
func(i+1, res+i); | |
}; | |
var sum_tick = function(i, res) { | |
process.nextTick(function() { sum(i,res); }); | |
}; | |
sum(1,0); | |
}; | |
var start = Date.now(); | |
calc(parseInt(process.argv[2], 10), function(x) { | |
console.log(x); | |
console.log('time = %d ms', Date.now() - start); | |
}); |
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