Fill
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Fillhttps://developer.mozilla.org/zh-CN/docs/Web/JavaScript/Reference/Global_Objects/Array/fill
Syntax: func Fill(elems []string, value string, start int, end ...int) []string
The Fill() method changes all elements in an array to a static value, from a start index (default 0) to an end index (default array.length). It returns the modified array.