startsWith, endsWith, and Finding Strings

    /**
     * String.prototype.startsWith(str [,pos]) //returns Boolean
     * String.prototype.endsWith(str [,pos])   //returns Boolean
     *
     * String.prototype.includes(str [,pos])  //returns Boolean
     * String.prototype.indexOf(str [,pos])  //returns -1 or position index
     * String.prototype.lastIndexOf(str [,pos])  //returns -1 or position index
     * String.prototype.charAt(pos)  //returns the single code point at that position
     * String.prototype.match(regExp); //returns an Array of matches or null. regex.test() and regex.exec()
     */
    let log = console.log;
    
    let sentence = 'How are you today?👋🏻';
    let len = sentence.length;
    let regexp = /[Ho]/g;
    
    log(sentence.indexOf('👋🏻'));     //18
    log(sentence.lastIndexOf('👋🏻')); //18
    log(sentence.includes('x'));     //false
    log(sentence.match(regexp));     // []  or null
    log(regexp.test(sentence));      // true
    log(sentence.charAt(0) === 'H');
    log(sentence.charAt(18));
    log(sentence.substring(18));
    
    log(sentence.startsWith('H'));
    log(sentence.startsWith('h'));
    log(sentence.startsWith('👋🏻', 18));
    log(sentence.endsWith('👋🏻'));