function remove_first_occurrence_of_word(str, word) {
const index = str.indexOf(word);
if (index === -1) {
return str;
}
return str.slice(0, index) + str.slice(index + word.length + 1);
}
let str = 'c++ c javascript python javascript php';
const word = 'javascript';
str = remove_first_occurrence_of_word(str, word);
console.log(str);
/*
run:
"c++ c python javascript php"
*/