19 lines
546 B
Lua
19 lines
546 B
Lua
local function insert(str, i, o)
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local first_half = str:sub(1, i - 1)
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local latter_half = str:sub(i, -1)
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return first_half .. o .. latter_half
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end
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local function tests()
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local res = insert("hello world", 1, "start: ")
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print(('insert("hello world", 1, "start: ") --> %s'):format(res))
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res = insert("hello world", 7, "small ")
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print(('insert("hello world", 7, "small ") --> %s'):format(res))
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res = insert("hello world", 12, "!")
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print(('insert("hello world", 12, "!") --> %s'):format(res))
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end
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tests()
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