*

1 files changed, 50 insertions, 0 deletions

diff --git a/js/b.js b/js/b.js
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index 0000000..d1d44b2
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+++ b/js/b.js
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+// b is for useful stuff 
+
+'use strict'
+
+const b = {
+	pipe: (...args) => args.reduce((acc, el) => el(acc)),
+	compose: (...fns) => (...args) => fns.reduceRight((res, fn) => [fn.call(null, ...res)], args)[0],
+	identity: x => x,
+	curry: (fn) => {
+	  let curried = (...args) => {
+	      if (args.length >= fn.length)
+	          return fn(...args)
+	      else
+	          return (...rest) => curried(...args, ...rest)
+	  }
+	  return curried
+	},
+	match: () => b.curry((what, s) => s.match(what)),
+	replace: () => b.curry((what, replacement, s) => s.replace(what, replacement)),
+	filter: () => b.curry((f, xs) => xs.filter(f)),
+	map: () => b.curry((f, xs) => xs.map(f))
+};
+
+
+// pipe
+const title = '10 Weird Facts About Dogs';
+const toLowerCase = (str) => str.toLowerCase();
+const addHyphens = (str) => str.replace(/\s/g, '-');
+const reverseText = (str) => (str === '') ? '' : reverseText(str.substr(1)) + str.charAt(0);
+const slug = b.pipe(title, toLowerCase, addHyphens, reverseText);
+console.log('pipe ', slug);
+
+
+// compose 
+const toUpperCase = x => x.toUpperCase();
+const exclaim = x => `${x}!`;
+const shout = b.compose(exclaim, toUpperCase);
+const ret = shout('send in the clowns'); // "SEND IN THE CLOWNS!"
+console.log('compose ', ret);
+
+
+// curry family
+const hasLetterR = b.match(/r/g);
+const r1 = hasLetterR('hello world');
+const r2 = hasLetterR('just j and s and t etc');
+const r3 = b.filter(hasLetterR, ['rock and roll', 'smooth jazz']);
+const noVowels = b.replace(/[aeiou]/ig);
+const censored = noVowels('*');
+const r4 = censored('Chocolate Rain');
+console.log('curry ', r1, r2, r3, r4);
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