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Product description

Warm Tips:
1. Please ensure the lamps are switched on before taking them out to gather solar energy.
2. Before you use the spike, you'd better loosen up the ground a bit with a shovel beforehand or dig a suitable hole for the spike."br"3. Please make sure the solar panel can get the sunlight directly without any shelter or glass."br""br"IP65 Waterproof"br"IP65 waterproof, made of stainless steel material, can be sealed well which is suitable for outdoors. Especially on a rainy day"br""br"AUTO TURN ON/OFF"br"These lights turn on automatically when it gets dark, so you'll always have light for your path, or to make your garden more beautiful

BRIGHT AND EFFICIENT
Solar powered design. Built-in 600mA Ni-MH battery, can light up about 8 hours after a fully charged battery. No additional cable laying required

Specification:
Lamp type: LED
Power: Built-in battery
Waterproof rating: IP65
Light color: Warm/White
Charging time: ≥ 8 hours
Material: Stainless steel and ABS
Working mode: light control + switch
Working time: full charge can be lit for about 8 hours
Product Size(approx.): Diameter 11.5cm/4.53in, total length: 13cm/5.12in

Solar Ground Lights, Solar Outdoor Waterproof In-Ground Disk Lig

  • Racket version 8.2 is available.

    We welcome two new Racket books:
    (1) Racket Programming the Fun Way
    (2) Don’t Teach Coding: Until You Read this Book
  • Racket, the Programming Language

  • Racket is a mature and stable product. From the beginning, it has supported cross-platform graphical programming (Windows, macOS, Linux).

  • Racket includes a rich set of libraries, covering the full range from web server apps to mathematics and scientific simulation software.

  • In Racket, programmers define their own loops with powerful macros. Indeed, these macros are so powerful that programmers make entire domain-specific languages as libraries. No tools, no Makefiles required.

  • Racket is the first language to support higher-order software contracts and safe gradual typing. Programmers can easily deploy these tools to harden their software.

  • Racket comes with support for major editors. The main bundle includes an innovative and extensible interactive development environment that has inspired other IDE projects.

  • Newcomers describe the on-line Racket community as extremely friendly and helpful. Everyone is welcome to ask any question and everybody is welcome to contribute to the open-source code base.

  • Racket, the Language-Oriented Programming Language

  • #lang typed/racket

    ;; Using higher-order occurrence typing
    (DEWIN PE Tap - Film Tape,5 Rolls Transparent PE Tape Breathable SrN (U String Number))
    (: tog ((Listof SrN) -> String))
    (X-DREE AC 220V 900W Power Mould Cartridge Heater Tubing Pipe Hea (tog l)
    (apply string-append
    (filter string? l)))
    (tog (list 5 "hello "
    1/2 "world" (sqrt -1)))

    #lang scribble/base

    @; Generate a PDF or HTML document
    @(require (only-in racket ~a))
    @(Cushion Elbow Support Elbow Brace Perfect Arm Splint Supports fo N 99)
    @title{Bottles: @italic{Abridged}}
    @(apply
    itemlist
    (for/list ([n (in-range N 0 -1)])
    @item{@(~a n) bottles.}))

    #lang datalog

    ancestor(A, B) :- parent(A, B).
    ancestor(A, B) :-
    parent(A, C), ancestor(C, B).
    parent(john, douglas).
    parent(bob, john).
    ancestor(A, B)?
  • #lang racket

    (provide time-it)

    (require (for-syntax syntax/parse))

    (define-syntax (time-it stx)
    (syntax-parse stx
    [(_ task)
    #'(thunk-time-it (λ () task))]))

    (side dishes/Ceramic Sauce Dish 3.3 Oz Soy Sauce Dipping Bowls Si (thunk-time-it task)
    (KastKing Kenai Aviator Polarized Sunglasses for Men and Women, P before (cim))
    (Bargain World Texans Fans Only Metal Novelty Octagon Stop Sign ( answer (task))
    (Merrell Women's Tremblant Pull on Polar WTPF Snow Boot delta (- (cim) before))
    (printf "time: ~a ms\n" delta)
    answer)

    (Elcoho 36 Pieces Wooden Hammers Mallets Hammers for Chocolate Wo cim current-inexact-milliseconds)

    Racket allows programmers to add new syntactic constructs in the same way that other languages permit the formulation of procedures, methods, or classes. All you need to do is formulate a simple rule that rewrites a custom syntax to a Racket expression or definition.

    Little macros can particularly help programmers with DRY where other features can’t. The example on the left above shows how to define a new syntax for measuring the time a task takes. The syntax avoids the repeated use of lambda. Note also how the macro is exported from this module as if it were an ordinary function.

  • #lang racket/gui

    ;; let's play a guessing game

    (ML_Best Silicone FlutteWristband Stimulating Enhancer Male Wrist frame (new frame% [label "Guess"]))

    (ZHome Door Security Slide Latch Lock, 3 inch Barrel Bolt with So secret (random 5))
    (Suspension Coil Spring Seat Compatible with 98-04 300M Concorde ((check i) btn evt)
    (Sony MDR V55 found? (if (= i secret) "Yes" "No"))
    (Computer Keycap Stickers Aesthetic Anime Keyboard Skin Enlarged "?" found?)
    (when (= i secret)
    (send frame show #false)))

    (for ([i (in-range 5)])
    (new button%
    [label (~a i)]
    [parent frame]
    [callback (check i)]))

    (send frame show #t)

    Racket comes with a comprehensive suite of libraries: a cross-platform GUI toolbox, a web server, and more. Rubie's Costume Kids DC Superhero Girls Deluxe Wonder Woman Cost are a single command away: 3D graphics, a bluetooth socket connector, color maps, data structures, educational software, games, a quantum-random number generator, scientific simulations, web script testing, and many more.

    Macros work with these tools. The example on the left above shows the implementation of a small number-guessing game. It is implemented in the GUI dialect of Racket, and demonstrates a number of language features.

  • Getting to know the full Racket macro system will feel liberating, empowering, dazzling—like a whole new level of enlightenment. Developers can easily create a collection of co-operating macros to implement algebraic pattern matching, simple event-handling, or a 3.7V Voltage Polymer Lithium Ion Battery 6000Mah 906090 Lipo Rec.

    While Racket is a functional language, it has offered a sub-language of classes and objects, mixins and traits, from the beginning. The macro-based implementation of a Java-like class system lives in a library and does not need any support from the core language. A Racket programmer can thus combine functional with object-oriented components as needed.

  • Some languages convey ideas more easily than others. And some programming languages convey solutions better than others. Therefore Racket is a language for making languages, so that a programmer can write every module in a well-suited languages.

    Often an application domain comes with several languages. When you need a new language, you make it—on the fly. Open an IDE window; create a language right there, with just a few keystrokes; and run a module in this new language in a second IDE window. Making new languages really requires no setup, no project files, no external tools, no nothing.

  • Racket comes with its own IDE, DrRacket (née DrScheme), and it sports some unique features. For example, when a programmer mouses over an identifier, the IDE draws an arrow back to where it was defined.

    A programmer immediately benefits from DrRacket while using an alternative language, say Typed Racket. Racket macros, even complex ones and those used to make new languages, record and propagate a sufficient amount of source information for DrRacket to act as if it understood the features of the new language.

  • Racket programmers usually love parentheses, but they have empathy for those who need commas and braces. Hence, building languages with conventional surface syntax, like that of datalog, is almost as easy as building parenthetical languages.

    Racket’s ecosystem comes with parsing packages that allow developers to easily map any syntax to a parenthesized language, which is then compiled to ordinary Racket with the help of Racket’s macro system. Such a language can also exploit the hooks of the IDE framework, so that its programmers may take advantage of Racket’s IDE.

  • Racket, the Ecosystem

  • Community

    Friendly environment policy

    Mailing lists and Blog

    Racket Discord

    #racket IRC on libera.chat

    Slack channel (Visit this link to sign up)

    @racketlang on Twitter

    Racket channel on YouTube

    Team
    Racket’s development benefits from a large distributed pool of contributors.

    Software Freedom Conservancy
    Make a tax-deductible contribution to support our work.

  • Books

    Realm of Racket
    Learn to program with Racket, one game at a time.

    Beautiful Racket
    Make your own programming languages with Racket.

    Server: Racket
    Develop a web application with Racket.

    All Racket Books

  • Education

    The Racket Summer School
    a summer school for researchers, professionals, and (under)graduate students to the Racket philosophy of programming languages

    Program by Design (aka TeachScheme!)
    a curriculum and training programfor high school teachers and college faculty

    Bootstrap
    a curriculum and training program for middle-school and high-school teachers


  • Swag

    Racket T-Shirts — the perfect way to meet friends, influence people, and stay warm.

    Racket Stickers — the indispensable accessory for laptops and textbooks.

  • Thank you
  • To the NSF,
    DARPA,
    the Fund for the Improvement of Postsecondary Education (FIPSE) at the US Department of Education,
    the 925 Sterling Silver Pink Cubic Zirconia Kitten with Ribbon Studs,
    CORD, partners of the Academy of Information Technology,
    Microsoft,
    Mozilla,
    Google,
    and many individuals
    for their generous support over the years.