Creating Lists<\/strong><\/p>\nFirst off we can create a list using square brackets and semi colon delimiters, for example<\/p>\n
\r\nlet list = ["One"; "Two"; "Three"]\r\n<\/pre>\nThis creates a string list using type inference, i.e. <\/p>\n
val list : string list = [“One”; “Two”; “Three”]<\/em><\/p>\nHad we wanted we could also create a list with a type hint mirroring this line (note the string list type hint)<\/p>\n
\r\nlet list : string list = ["One"; "Two"; "Three"]\r\n<\/pre>\nWe can also define this list without the semi-colon delimiter, instead using newlines as per<\/p>\n
\r\nlet list = [\r\n "One"\r\n "Two"\r\n "Three"]\r\n<\/pre>\nWe can declare an empty list as follows<\/p>\n
\r\nlet list = []\r\n<\/pre>\nWe can also declare lists using the range operator, for example<\/p>\n
\r\nlet list = ['a' .. 'z']\r\n<\/pre>\nWhilst we can define a list of data as above, we can also generate the list in the following way<\/p>\n
\r\nlet list = [for i in 'A' .. 'Z' -> i]\r\n<\/pre>\nOperators<\/strong><\/p>\nThe double colon :: operator takes a left hand argument as a single item and the right hand side as a list and creates a new list which is made up of the left hand argument and then right hand list appended to it. So, for example<\/p>\n
\r\nlet original = [1; 2; 3]\r\nlet list = 0 :: original\r\n<\/pre>\nwill result in list being [0; 1; 2; 3]<\/p>\n
We can also concatenate lists using the @ operator, for example<\/p>\n
\r\nlet right = [1; 2; 3]\r\nlet left = [3; 2; 1]\r\n\r\nlet combined = left @ right\r\n<\/pre>\nThis results in a new list which looks like [3; 2; 1; 1; 2; 3]<\/p>\n","protected":false},"excerpt":{"rendered":"
In a previous post I touched on F# lists, now let’s look a little further into the F# lists. Note: Also check out Lists (F#) for a far more comprehensive view of F# lists The MSDN documentation states that F# lists are implemented as singly linked lists. Creating Lists First off we can create a […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[6],"tags":[],"class_list":["post-1050","post","type-post","status-publish","format-standard","hentry","category-f"],"jetpack_sharing_enabled":true,"jetpack_featured_media_url":"","_links":{"self":[{"href":"https:\/\/putridparrot.com\/blog\/wp-json\/wp\/v2\/posts\/1050","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/putridparrot.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/putridparrot.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/putridparrot.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/putridparrot.com\/blog\/wp-json\/wp\/v2\/comments?post=1050"}],"version-history":[{"count":13,"href":"https:\/\/putridparrot.com\/blog\/wp-json\/wp\/v2\/posts\/1050\/revisions"}],"predecessor-version":[{"id":1070,"href":"https:\/\/putridparrot.com\/blog\/wp-json\/wp\/v2\/posts\/1050\/revisions\/1070"}],"wp:attachment":[{"href":"https:\/\/putridparrot.com\/blog\/wp-json\/wp\/v2\/media?parent=1050"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/putridparrot.com\/blog\/wp-json\/wp\/v2\/categories?post=1050"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/putridparrot.com\/blog\/wp-json\/wp\/v2\/tags?post=1050"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}