Reading form values

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input.value is always a string — convert before maths.

What type is input.value?

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const i=document.createElement('input');
i.value='42';
document.body.appendChild(i);
console.log(Number(i.value)+1);

JavaScript 1 automatic check The DOM

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const i=document.createElement('input');
i.value='42';
document.body.appendChild(i);
console.log(Number(i.value)+1);

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