run length encoding javascript code example
Example: run length encoding javascript
function encode(code) {
if (!code) return '';
let encode = '';
for (let i = 0; i < code.length; i++) {
let count = 1;
for (let j = i; j < code.length; j++) {
if (code[i] !== code[j+1]) break;
count++;
i++;
}
encode += count === 1 ? code[i] : count + code[i];
}
return encode
}
encode("WWWWWWWWWWWWBWWWWWWWWWWWWBBBWWWWWWWWWWWWWWWWWWWWWWWWB"); // "12WB12W3B24WB"
encode("AABBBCCCC"); // "2A3B4C"
encode(""); // ""