Shortest Distance to a Character.js

/**
 * @param {string} s
 * @param {character} c
 * @return {number[]}
 */
var shortestToChar = function(s, c) {
    
    let result = []
    
    for(let i = 0; i< s.length ; i++) {
        
        if(s.charAt(i) === c) result.push(0)
        else {
            const next = s.indexOf(c,i) === -1 ? Infinity : s.indexOf(c,i) -i
            const prev = result.lastIndexOf(0) === -1 ? Infinity : i- result.lastIndexOf(0) 
            result.push(Math.min(next,prev))
        }
        
    }
    
    return result
};