How to sum different types of variables in JavaScript? [duplicate]

Question

var i1=3;
var i2="3";

var i3= i1+i2;
var i4= i2+i1;

So, i3 must be of type integer because of i1 and i4 must be of type string because of i2, but when I launch the code it turns out completely different. They are both equal to "33". How to sum them?

Does this answer your question? JavaScript adding a string to a number — Michael Bianconi
– Michael Bianconi, Commented Jan 23, 2020 at 19:49
" i3 must be of type integer because of i1" - Why do you think so? If any of the operands in op1 + op2 is a string the other operand will also be converted into a string. — Andreas
– Andreas, Commented Jan 23, 2020 at 19:50

Zohaib Ijaz · Accepted Answer · 2020-01-23 19:50:47Z

1

Use Number() to parse values to number (integer/float)

var i1 = 3;
var i2 = "3";

var i3 = Number(i1) + Number(i2);
var i4 = Number(i2) + Number(i1);

console.log('i3', i3);

console.log('i4', i4);

answered Jan 23, 2020 at 19:50

Zohaib Ijaz

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