String length: Difference between revisions

=={{header|Lambdatalk}}==

The lambdatalk {W.length string} function returns the number of bytes in a string. For Unicode characters made of two bytes things are a little bit more tricky. It's easy to add (inline) a new javascript primitive to the dictionary:

<lang scheme>

{script

LAMBDATALK.DICT["W.unicodeLength"] = function() {

function countCodePoints(str) {

var point,

index,

width = 0,

len = 0;

for (index = 0; index < str.length;) {

point = str.codePointAt(index);

width = 0;

while (point) {

width += 1;

point = point >> 8;

}

index += Math.round(width/2);

len += 1;

}

return len;

}

var args = arguments[0].trim();

return countCodePoints(args)

};

}

Testing:

{W.length Hello, World!} -> 13

{W.length José} -> 4

{W.unicodeLength José} -> 4

{W.length 𝔘𝔫𝔦𝔠𝔬𝔡𝔢} -> 14

{W.unicodeLength 𝔘𝔫𝔦𝔠𝔬𝔡𝔢} -> 7

</lang>