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@Kyly

Kyly/validateNumber.js

Created November 8, 2018 19:50
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validateNumber.js
function validateNumber(value) {
let error;
if (!/^('^\\d+$')$/i.test(value)) {
error = 'Only numbers allowed';
}
return error;
}
@Kyly
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Kyly commented Nov 8, 2018 •
edited
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const assert = require('assert').strict;

const validateNumber = value => { 
    let error; 
    if (!/^[0-9]*$/.test(value)) { 
        error = 'Only numbers allowed'; 
    } 
    return error; 
};

try {
    assert.ok(validateNumber('1') === undefined);
    assert.ok(validateNumber('1.1') !== undefined);
    assert.ok(validateNumber(1) === undefined);
    assert.ok(validateNumber(1.1) !== undefined);
} catch(error) {
    console.error(error.message);
    process.exit(1);
}

console.log('Ok!');
process.exit(0);

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ghost commented Nov 8, 2018

1.1 = false
'1.1' = false
'1a1' = false
1.1 = false
11 = true

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ghost commented Nov 8, 2018

/^[0-9]*$/ checks if input only consists of the numbers 0-9 appearing 0 or more times

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