so many shitty str -> binary converters out there. here's a decent one.

str2bin.js

strToBin = (function() {
    var binarr = [] // build an array to hold the binary form of 0-255
    for(var i = 0; i < 256; i++) {
        bins = ''
        for(var j = 7; j >= 0; j--) {
            c = Math.pow(2, j)
            bins += (i & c) == c ? '1' : '0'
        }   
        binarr.push(bins)
    }
    return function(str, sep) { // return anonymous function using local closure.
        sep = sep || ''
        out = []
        c = str.charCodeAt
        l = str.length
        for(var i = 0; i < l; i++) {
            out.push(binarr[c(i) & 255]) // prevent overflow.
        }
        return out.join(sep);
    }
}())
    
    
console.log(strToBin)
console.log(strToBin('hello world', ' '))