Xah Web Dev Blog Archive 2014-05

2014-05-26

JavaScript quiz: why doesn't this work?

// JavaScript quiz. Why doesn't this work?

var obj = { "a":3, "b":7, "c":2, "d":9};

var keys = Object.keys(obj);

var sorted_keys = keys.sort(function (a,b) {return obj[a] >= obj[b]});

console.log(sorted_keys);       // [ 'c', 'a', 'b', 'd' ] ??

ANSWER (rot13): orpnhfr gur fbeg zrgubq'f cerqvpngr shapgvba arrqf gb erghea artngvir mreb cbfvgvir, abg gehr snyfr.

2014-05-26

JS: Operators (new page)

2014-05-26

JS: sum array

// example of writing a sum function
function sum (list) { return list.reduce(function (a,b) {return a+b;} );}

console.log(sum([3,1,2]));          // 6

〔►see JS: Array.prototype〕

〔►see JS: Functional Programing〕

2014-05-26

now complete. Computer Languages Characters Frequency (with JavaScript + svg charts)

2014-05-26

JS: String Code Unit vs Code Point (on its own page)

2014-05-25

JavaScript DOM “setAttribute” — the pain in functional programing's neck.

2014-05-11

CSS: Letter Spacing, Word Spacing

2014-05-10

CSS: Font Weight, Bold