WoW:API foreachi: Difference between revisions
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From [http://lua-users.org/wiki/TableLibraryTutorial TableLibraryTutorial] of lua-users.org. | From [http://lua-users.org/wiki/TableLibraryTutorial TableLibraryTutorial] of lua-users.org. | ||
table.foreachi(table, f) | table.foreachi(table, f) | ||
foreaci(table, f) | |||
Apply the function f to the elements of the table passed. On each iteration the function f is passed the index-value pair of that element in the table. This is similar to table.foreach() except that index-value pairs are passed, not key-value pairs. If the function f returns a non-nil value the iteration loop terminates. | Apply the function f to the elements of the table passed. On each iteration the function f is passed the index-value pair of that element in the table. This is similar to table.foreach() except that index-value pairs are passed, not key-value pairs. If the function f returns a non-nil value the iteration loop terminates. | ||
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In the above, it starts at t[1] (''not'' t[0]) and counts to t[3], printing the corresponding values along the way. It then checks t[4], sees it is nil, and stops running. t[5] is never checked - this ''will not hit every array index in a table, only the consecutive ones from one up until it hits its first blank index.'' | In the above, it starts at t[1] (''not'' t[0]) and counts to t[3], printing the corresponding values along the way. It then checks t[4], sees it is nil, and stops running. t[5] is never checked - this ''will not hit every array index in a table, only the consecutive ones from one up until it hits its first blank index.'' | ||
Latest revision as of 04:45, 15 August 2023
← WoW Lua
From TableLibraryTutorial of lua-users.org.
table.foreachi(table, f) foreaci(table, f)
Apply the function f to the elements of the table passed. On each iteration the function f is passed the index-value pair of that element in the table. This is similar to table.foreach() except that index-value pairs are passed, not key-value pairs. If the function f returns a non-nil value the iteration loop terminates.
> t = { 1,2,"three"; pi=3.14159, banana="yellow" }
> table.foreachi(t, print)
1 1
2 2
3 three
Note in the example only the indexed elements of the table are displayed. See the TablesTutorial for more information on key-value and index-value pairs.
Also note that foreachi starts at index [1], increments the index by one repeatedly, and stops running as soon as it reaches a nil value. This is an example:
> t = { [0] = "zero", --will not be counted
[1] = "one", --will be counted; 1
[2] = "two", --will be counted; 2
[3] = "three", --will be counted; 3
["four"] = "four", --will not be counted; returns 3
[5] = "five" } --will never be reached
> foreachi(t, print)
1 one
2 two
3 three
In the above, it starts at t[1] (not t[0]) and counts to t[3], printing the corresponding values along the way. It then checks t[4], sees it is nil, and stops running. t[5] is never checked - this will not hit every array index in a table, only the consecutive ones from one up until it hits its first blank index.