| Stream.prototype.log = function(prefix) { | |
| this.forEach( | |
| v => console.log(prefix, v), | |
| err => console.log(prefix, ' error!!', err), | |
| () => console.log(prefix, ' end.') | |
| ); | |
| } | |
| Stream.seq([1,2,3], 0, 1000).log('seq') |
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