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Function std.algorithm.mutation.stripLeft

The strip group of functions allow stripping of either leading, trailing, or both leading and trailing elements.

Range stripLeft(Range, E) (
  Range range,
  E element
)
if (isInputRange!Range && is(typeof(range.front == element) : bool));

Range stripLeft(alias pred, Range) (
  Range range
)
if (isInputRange!Range && is(typeof(pred(range.front)) : bool));

The stripLeft function will strip the front of the range, the stripRight function will strip the back of the range, while the strip function will strip both the front and back of the range.

Note that the strip and stripRight functions require the range to be a BidirectionalRange range.

All of these functions come in two varieties: one takes a target element, where the range will be stripped as long as this element can be found. The other takes a lambda predicate, where the range will be stripped as long as the predicate returns true.

Parameters

NameDescription
range a bidirectional range or input range
element the elements to remove

Returns

a Range with all of range except element at the start and end

Example

Strip leading and trailing elements equal to the target element. 

writeln("  foobar  ".strip(' ')); // "foobar"
writeln("00223.444500".strip('0')); // "223.4445"
writeln("ëëêéüŗōpéêëë".strip('ë')); // "êéüŗōpéê"
writeln([1, 1, 0, 1, 1].strip(1)); // [0]
writeln([0.0, 0.01, 0.01, 0.0].strip(0).length); // 2

Example

Strip leading and trailing elements while the predicate returns true. 

writeln("  foobar  ".strip!(a => a == ' ')()); // "foobar"
writeln("00223.444500".strip!(a => a == '0')()); // "223.4445"
writeln("ëëêéüŗōpéêëë".strip!(a => a == 'ë')()); // "êéüŗōpéê"
writeln([1, 1, 0, 1, 1].strip!(a => a == 1)()); // [0]
writeln([0.0, 0.01, 0.5, 0.6, 0.01, 0.0].strip!(a => a < 0.4)().length); // 2

Example

Strip leading elements equal to the target element. 

writeln("  foobar  ".stripLeft(' ')); // "foobar  "
writeln("00223.444500".stripLeft('0')); // "223.444500"
writeln("ůůűniçodêéé".stripLeft('ů')); // "űniçodêéé"
writeln([1, 1, 0, 1, 1].stripLeft(1)); // [0, 1, 1]
writeln([0.0, 0.01, 0.01, 0.0].stripLeft(0).length); // 3

Example

Strip leading elements while the predicate returns true. 

writeln("  foobar  ".stripLeft!(a => a == ' ')()); // "foobar  "
writeln("00223.444500".stripLeft!(a => a == '0')()); // "223.444500"
writeln("ůůűniçodêéé".stripLeft!(a => a == 'ů')()); // "űniçodêéé"
writeln([1, 1, 0, 1, 1].stripLeft!(a => a == 1)()); // [0, 1, 1]
writeln([0.0, 0.01, 0.10, 0.5, 0.6].stripLeft!(a => a < 0.4)().length); // 2

Example

Strip trailing elements equal to the target element. 

writeln("  foobar  ".stripRight(' ')); // "  foobar"
writeln("00223.444500".stripRight('0')); // "00223.4445"
writeln("ùniçodêéé".stripRight('é')); // "ùniçodê"
writeln([1, 1, 0, 1, 1].stripRight(1)); // [1, 1, 0]
writeln([0.0, 0.01, 0.01, 0.0].stripRight(0).length); // 3

Example

Strip trailing elements while the predicate returns true. 

writeln("  foobar  ".stripRight!(a => a == ' ')()); // "  foobar"
writeln("00223.444500".stripRight!(a => a == '0')()); // "00223.4445"
writeln("ùniçodêéé".stripRight!(a => a == 'é')()); // "ùniçodê"
writeln([1, 1, 0, 1, 1].stripRight!(a => a == 1)()); // [1, 1, 0]
writeln([0.0, 0.01, 0.10, 0.5, 0.6].stripRight!(a => a > 0.4)().length); // 3

Authors

Andrei Alexandrescu

License

Boost License 1.0.