How do I calculate the sum of all the numbers in a string by using the JavaScript ? In the example below, the expected result would be 2+0+1+5. My attempt is below.
var a = "weare20boysand15girls";
var i;
for(i=0; i<a.length; i++){
var b = Number(a[i]);
var c=0;
c += b;
console.log(c);
Use regular expression to find all the integers. and use reduce function to compute sum
var a = "weare20boysand15girls";
var res = a.replace(/\D+/g, '').split('').reduce((a, b) => {
return parseInt(a) + parseInt(b);
});
console.log(res)in the question you asked for an expected result of 2015
the given string is
var a = "weare20boysand15girls";
the oneliner for this solution:
console.log([...a].filter( e => isFinite(e)).join(''));
but you marked as correct answer an result of 8
the oneliner for this solution:
console.log([...a].filter( e => isFinite(e)).reduce((a, b)=>parseInt(a)+parseInt(b)));
Use regex only when it is impossible to use an other way...
[...a]convert the string to an array. i .filter this array and Check whether a number is isFinite, legal number. the sum function reducemust not be explained (?)You can try :
var a = "weare20boysand15girls";
var b = a.match(/(\d)/g).map((a) => parseInt(a)).reduce((a,b) => a + b);
I would suggest regex solution for this. Separate number from your whole string by digits [0-9] regex and sum up them using loop.
var a = "weare20boysand15girls";
const regex = /[0-9]/g;
var num = a.match(regex);
var result=0;
num.forEach(function(match){
result+=parseInt(match);
});
console.log(result);You could
const input = "weare20boysand15girls";
const result =
// Transform the string to an array.
input.split("")
// Use the reduce function to sum only the elements that are numbers.
.reduce((sum, el) => isNaN(el) ? sum : sum + Number(el), 0);
check the ascii value to identify numerical characters, and then sum it
var sum = 0;
var a = "weare20boysand15girls";
for (var i; i < a.length; i++) {
if (a.charCodeAt(i) >= 48 && a.charCodeAt(i) <= 57) {
sum += a.charCodeAt(i) - 48;
}
}
console.log(sum);//Try this: You have to split the string to an array and then test each character for addition.
function sumNumbers_in_a_String() {
var strName = "weare20boysand15girls";
var strArray = strName.split("");
var c = 0;
var l = strArray.length;
for (var i = 0; i < l; i++){
if (parseInt(strArray[i])){
var b = Number(strArray[i]);
var c = c + b;
}
}
}
