The OpenD Programming Language

dropBack

Convenience function which calls std.range.primitives.popFrontN(range, n) and returns range. drop makes it easier to pop elements from a range and then pass it to another function within a single expression, whereas popFrontN would require multiple statements.

dropBack provides the same functionality but instead calls std.range.primitives.popBackN(range, n)

Note: drop and dropBack will only pop up to n elements but will stop if the range is empty first. In other languages this is sometimes called skip.

R
dropBack
(
R
)
(,
size_t n
)
if (
isBidirectionalRange!R
)

Parameters

range R

the input range to drop from

n size_t

the number of elements to drop

Return Value

Type: R

range with up to n elements dropped

Examples

import std.algorithm.comparison : equal;

assert([0, 2, 1, 5, 0, 3].dropBack(3) == [0, 2, 1]);
assert("hello world".dropBack(6) == "hello");
assert("hello world".dropBack(50).empty);
assert("hello world".drop(4).dropBack(4).equal("o w"));
import std.algorithm.comparison : equal;

assert([0, 2, 1, 5, 0, 3].drop(3) == [5, 0, 3]);
assert("hello world".drop(6) == "world");
assert("hello world".drop(50).empty);
assert("hello world".take(6).drop(3).equal("lo "));

See Also

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