Simple chain monad

_chainMonadReadme.md

Overview

Creates a very simple monad, so you can give it a value - continually modifying it as you'd like, and then get a value out of it.

Example

addTwo = (value) => value + 2;
addTwo(3); // 5

console.log(
 utils.chain(3)
   .chain(addTwo) // (3 + 2)
   .chain(addTwo) // (5 + 2)
   .debug() // consoles 7 and passes the value along
   // define a function inline
   .chain((value) => value + 3) // (7 + 3)
   .close()
);

// 7
// 10

available as a bookmarklet:

• save a bookmark
• edit and replace the url with the following:

javascript:void%20function(){function%20chain(r){return{value:r,chain:function(n){return%20chain(n(r))},close:function(){return%20r},toArray:function(){return%20chain(Array.from(r))},chainFilter:function(n){if(!Array.isArray(r))throw%20Error(`chainFilter%20expected%20an%20array,%20but%20was%20passed:${r}`);return%20chain(r.filter(n))},chainMap:function(n){if(!Array.isArray(r))throw%20Error(`chainMap%20expected%20an%20array,%20but%20was%20passed:${r}`);return%20chain(r.map(n))},chainReduce:function(n,a){if(!Array.isArray(r))throw%20Error(`chainReduce%20expected%20an%20array,%20but%20was%20passed:${r}`);return%20chain(r.reduce(n,a))},selectAt:function(n){if(!Array.isArray(r))throw%20Error(`selectAt%20expected%20an%20array,%20but%20was%20passed:${r}`);return%20chain(r[n])},replace:function(r){return%20chain(r)},exec:function(n){return%20n(r),chain(r)},debug:function(n){return%20n%3Fn(r):console.log(r),chain(r)}}}window.chain=chain}();

chainMonad.js

function chain(value) {
  return ({
    value,
    chain: function innerChain(fn) {
      return chain(fn(value));
    },
    close: function close() {
        return value;
    },
    toArray: function toArray() {
        return chain(Array.from(value));
    },
    chainFilter: function chainFilter(fn) {
      if (!Array.isArray(value)) throw Error(`chainFilter expected an array, but was passed:${value}`);
      return chain(value.filter(fn));
    },
    chainMap: function chainMap(fn) {
      if (!Array.isArray(value)) throw Error(`chainMap expected an array, but was passed:${value}`);
      return chain(value.map(fn));
    },
    chainReduce: function chainReduce(fn, initialValue) {
      if (!Array.isArray(value)) throw Error(`chainReduce expected an array, but was passed:${value}`);
      return chain(value.reduce(fn, initialValue));
    },
    selectAt: function selectAt(index) {
      if (!Array.isArray(value)) throw Error(`selectAt expected an array, but was passed:${value}`);
      return chain(value[index]);
    },
    replace: function replace(val) {
      return chain(val);
    },
    exec: function exec(fn) {
        fn(value);
        return chain(value);
    },
    debug: function debug(fn) {
      if (fn) {
        fn(value);
      } else {
        console.log(value);
      }
      return chain(value);
    }
  });
};
window.chain = chain;

z_bookmarklet.md

Short Way

function bookmarkify(str) {
    const cleanStr = encodeURIComponent(str.replaceAll(/[ \t]*\n[ \t\n]+/g, ''));
    const newStr = `(()=>{${cleanStr}})()`;
    return `javascript:${cleanStr}`;
}

Long Way

1. Minfy chain like this:

https://minify-js.com/

(() => {
function chain(value) {
    ...
};
window.chain = chain;
console.log(`window.chain added`);
})();

2. urlencodeComponent

https://www.urlencoder.org/

3. javascript:${RESULT]