start
start(iter) -> state
Get initial iteration state for an iterable object
Examples
Example 1: Get initial state for an array:
julia> arr = [1, 2, 3, 4, 5];
julia> start(arr)
1In this example, the start function returns the initial state of the array arr, which is the first element of the array.
Example 2: Get initial state for a range object:
julia> rng = 1:5;
julia> start(rng)
1The start function returns the initial state of the range object rng, which is the first element of the range.
Example 3: Get initial state for a string:
julia> str = "Hello";
julia> start(str)
'H': ASCII/Unicode U+0048 (category Lu: Letter, uppercase)Here, the start function returns the initial state of the string str, which is the first character of the string.
Common mistake example:
julia> num = 10;
julia> start(num)
ERROR: MethodError: no method matching start(::Int64)This example shows a common mistake where the start function is used on a non-iterable object. The start function can only be applied to iterable objects like arrays, ranges, strings, etc. It cannot be used on a single number or non-iterable data types.
See Also
countfrom, cycle, done, drop, eachindex, enumerate, first, repeated, rest, start, svds, take, vecdot, vecnorm, zip,User Contributed Notes
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