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import { Layout, makeScene2D } from "@motion-canvas/2d";
import {
Direction,
beginSlide,
createRef,
slideTransition,
} from "@motion-canvas/core";
import {
CodeBlock,
edit,
insert,
range,
} from "@motion-canvas/2d/lib/components/CodeBlock";
import { cardGeneratorForSource } from "./function_dna";
import { cardGeneratorsForSource } from "./currying";
export default makeScene2D(function* (view) {
const curried = createRef<CodeBlock>();
view.add(
<Layout direction="row" gap={100} layout>
<CodeBlock
fontSize={25}
language="typescript"
ref={curried}
code={cardGeneratorForSource}
/>
</Layout>,
);
yield* slideTransition(Direction.Left);
yield* beginSlide("show function");
yield* curried().edit(
1,
)`const cardGeneratorFor = (person: PersonI, type: string): (() => CardI) => {
const birthdayCardGenerator = () => birthdayCardFn(person); // closure
const valentineCardGenerator = () => valentineCardFn(person); // closure${insert(
"\n",
)}
${insert(`const generatorForType = (type: string) => {`)}
${insert(" ")}switch (type) {
${insert(" ")} case "valentine":
${insert(" ")} return valentineCardGenerator;
${insert(" ")} case "birthday":
${insert(" ")} return birthdayCardGenerator;
${insert(" ")}}
${insert(" ")}throw new Error(type + " not implemented");
${insert("};\n")}}`;
yield* beginSlide("first currying step");
yield* curried().edit(
1,
)`const cardGeneratorFor = (person: PersonI, type: string): (() => CardI) => {
const birthdayCardGenerator = () => birthdayCardFn(person); // closure
const valentineCardGenerator = () => valentineCardFn(person); // closure
const generatorForType = (type: string) => {
switch (type) {
case "valentine":
return valentineCardGenerator;
case "birthday":
return birthdayCardGenerator;
}
throw new Error(type + " not implemented");
};${insert("\n\n return generatorForType;")}
}`;
yield* beginSlide("second currying step");
yield* curried().edit(1)`const ${edit(
"cardGeneratorFor",
"cardGeneratorsFor",
)} = ${edit(
"(person: PersonI, type: string)",
"(person: PersonI)",
)}: (() => CardI) => {
const birthdayCardGenerator = () => birthdayCardFn(person); // closure
const valentineCardGenerator = () => valentineCardFn(person); // closure
const generatorForType = (type: string) => {
switch (type) {
case "valentine":
return valentineCardGenerator;
case "birthday":
return birthdayCardGenerator;
}
throw new Error(type + " not implemented");
};
return generatorForType;
}`;
yield* beginSlide("third currying step");
yield* curried().edit(1)`const cardGeneratorsFor = (person: PersonI): ${edit(
"(() => CardI)",
"((type: string) => () => CardI)",
)} => {
const birthdayCardGenerator = () => birthdayCardFn(person); // closure
const valentineCardGenerator = () => valentineCardFn(person); // closure
const generatorForType = (type: string) => {
switch (type) {
case "valentine":
return valentineCardGenerator;
case "birthday":
return birthdayCardGenerator;
}
throw new Error(type + " not implemented");
};
return generatorForType;
}`;
yield* beginSlide("fourth currying step");
yield* curried().edit(1)`${edit(
cardGeneratorsForSource,
`const alanCardGenerator = (type: string): (() => CardI) => {
const alan: PersonI = {
name: "Alan Turing",
birthday: new Date("06/23/1912"),
color: theme.green.hex,
};
return cardGeneratorFor(alan, type);
};`,
)}`;
yield* beginSlide("partial application");
yield* curried().selection(
[...range(7, 9, 7, 38), ...range(0, 26, 0, 40)],
1,
);
yield* beginSlide("highlight");
yield* curried().edit(
1,
)`const alanCardGenerator = (type: string): (() => CardI) => {
const alan: PersonI = {
name: "Alan Turing",
birthday: new Date("06/23/1912"),
color: theme.green.hex,
};
return cardGeneratorFor(alan, type);
};${insert(`
(alanCardGenerator("valentine")()).message === (cardGeneratorsFor(alan)("valentine")()).message;`)}`;
yield* beginSlide("show application of pa");
});
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