Validate pipe
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const MIN_LENGTH = 3;
const PATTERN = /^([0-9]\d*)?$/;
const MIN = 2;
const MAX = 4;
let errors = [];
const errorMessages = {
validateText: 'Requried!',
validateMinLengthText: 'Too short!',
validateMaxLengthText: 'Too long!'
};
const fieldValue = '';
const validateText = (text) => Boolean(text.length);
const validateMinLengthText = (text) => text.length > MIN_LENGTH;
const requiredField = (value) => Boolean(value) ? undefined : 'Requierd field';
const minLengthField = (value) => value.length > MIN_LENGTH ? undefined : 'Text is too short';
const patternValidate = (value) => PATTERN.test(value) ? undefined : 'Wrong pattern';
const maxValue = (value) => value <= MAX ? undefined : 'More than max';
const minValue = (value) => value >= MIN ? undefined : 'Less than min';
/**
* Main validation
*/
const validator = (fns, errorMessages) => fieldValue => !fns.reduce((acc, validate) => {
if (typeof validate !== 'function') {
throw new Error('Not a function');
}
const isValid = validate(fieldValue);
if (!isValid) {
errors = errors.concat([errorMessages[validate.name]]);
}
acc.push(isValid);
return acc;
}, []).some(result => !result);
const validation = (fns, fieldValue) => {
let err;
fns.forEach(func => {
if (!err) {
err = func(fieldValue);
console.log('validate: ', err);
}
});
return err;
};
const err = validation([patternValidate, minValue, maxValue], 3);
// console.log(validator([validateText, validateMinLengthText], errorMessages)(fieldValue));
// console.log(errors);
console.log('Err: ', err);
function validator2(...fns) {
return (value) => {
return fns.reduce((acc, item) => item(value) ? [...acc, item(value)] : acc, []);
};
}
const validate = validator2(
requiredField,
minLengthField
);
console.log(validate('aaaaaaaaa'));
JavaScript
INFO