So I'm working on a homework assignment where I'm supposed track the "how many points a sports team has earned in a season" by writing a function called getTotalPoints that accepts a string of letters and returns the total points earned. These letters would be any series of "w" (wins) "d" (draws) and/or "l"(losses).
The assignment includes a pre-defined number value to each letter (w = 3, d = 1, and l =0), a helper function to draw out these values getPointsFromResult, and the function with a string param passed, getTotalPoints('wwdl') to test the getTotalPoints function I wrote works properly.
I got as a far as turning the string into an array and then tried to iterate on that array. The correct answer should be 7, but I am getting a result of 16, because it seems that forEach loop is iterating everything x's 4 (4 being the length of the array) As a result of 4 sets of 3+1+0 (essentially 4 x 4).
I have no idea how to move forward from here and am completely stuck.
const RESULT_VALUES = {
w: 3,
d: 1,
l: 0
}
/**
* Takes a single result string and (one of 'w', 'l', or 'd')
* and returns the point value
*
* @param {string} result
* @returns {number} point value
*/
function getPointsFromResult(result) {
return RESULT_VALUES[result];
}
// Create getTotalPoints function which accepts a string of results
// including wins, draws, and losses i.e. 'wwdlw'
// Returns total number of points won
let getTotalPoints = function(pointsString) {
let pointsArray = Array.from(pointsString);
console.log(pointsArray);
let sum = 0
pointsArray.forEach(function(result) {
console.log(result)
let wins = getPointsFromResult('w');
let draws = getPointsFromResult('d');
let losses = getPointsFromResult('l');
console.log(wins);
console.log(draws);
console.log(losses);
sum += wins;
sum += draws;
sum += losses;
})
return sum;
};
// Check getTotalPoints
console.log(getTotalPoints('wwdl')); // should equal 7How about something like this:
const RESULT_VALUES = {
w: 3,
d: 1,
l: 0
}
function getPointsFromResult(result) {
return RESULT_VALUES[result];
}
let getTotalPoints = function(pointsString) {
let pointsArray = Array.from(pointsString);
// Put value of each letter into a results array:
let results = pointsArray.map(result => getPointsFromResult(result));
// Sum all values in above results array to get total.
let sum = results.reduce((a, b) => a + b, 0);
return sum;
};
console.log(getTotalPoints('wwdl')); // should equal 7split() "wwdl" string into an array:
'wwdl'.split('') //['w', 'w', 'd', 'l']
Then get each key of the object ('w', 'd', 'l') and get the value (3, 1, 0).
object['w'] // first iteration 3
object['w'] // second iteration 3
object['d'] // third iterayion 1
object['l'] // fourth iteration 0
.reduce() can add the values and return a sum:
sum + current value
In the example below log(data) is just a helper function to log to console easier.
const log = data => console.log(JSON.stringify(data));
const record = `wwdl`;
const totalScore = record => {
const scoring = {
w: 3,
d: 1,
l: 0
};
let recArr = record.split('');
log('String as an Array:');
log(recArr);
return recArr.reduce((sum, cur) => {
log('Current Key: ' + cur + ': return: ' + scoring[cur]);
return sum + scoring[cur];
}, 0);
};
log('Total Score: ' + totalScore(record));.as-console-row::after {
width: 0;
font-size: 0;
}
.as-console-row-code {
width: 100%;
word-break: break-word;
}