@beenotung/tslib/pipe.js

utils library in Typescript

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.Chain = exports.pipe = void 0;
exports.peek = peek;
exports.createChain = createChain;
const curry_1 = require("./curry");
/**
 * the function<A,B> :: A,...* -> B
 *   - first argument must be type A
 *   - other arguments can be any type
 *   - must return type B
 *
 * @example
 *   pipe([
 *     [ x=>x+2 ]
 *   , [ (x,y)=>x*2+y, [5] ]
 *   ]) (2) ~> 13
 * */
/**
 * auto curried Elixir style pipe
 *
 * pipe :: PipeArg p => [p] -> a -> *
 *   - don't have to be of same type (like chain)
 * */
exports.pipe = (0, curry_1.curry)((ps, acc) => {
    for (const p of ps) {
        if (p.length === 2) {
            // has extra args
            acc = p[0](acc, ...p[1]);
        }
        else {
            // no extra args
            acc = p[0](acc);
        }
    }
    return acc;
});
/**
 * non-curried version of echoF in functional.ts
 *
 * echo :: (a->*) -> a -> a
 * */
function peek(f) {
    return a => {
        f(a);
        return a;
    };
}
class Chain {
    value;
    constructor(value) {
        this.value = value;
    }
    use(f) {
        f(this.value);
        return this;
    }
    map(f) {
        return new Chain(f(this.value));
    }
    unwrap() {
        return this.value;
    }
}
exports.Chain = Chain;
function createChain(a) {
    return new Chain(a);
}