You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
43 lines
911 B
JavaScript
43 lines
911 B
JavaScript
10 months ago
|
'use strict';
|
||
|
|
|
||
|
|
const assert = require('assert');
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Given a value, cast it to a number, or throw an `Error` if the value
|
||
|
|
* cannot be casted. `null` and `undefined` are considered valid.
|
||
|
|
*
|
||
|
|
* @param {Any} value
|
||
|
|
* @return {Number}
|
||
|
|
* @throws {Error} if `value` is not one of the allowed values
|
||
|
|
* @api private
|
||
|
|
*/
|
||
|
|
|
||
|
|
module.exports = function castNumber(val) {
|
||
|
|
if (val == null) {
|
||
|
|
return val;
|
||
|
|
}
|
||
|
|
if (val === '') {
|
||
|
|
return null;
|
||
|
|
}
|
||
|
|
|
||
|
|
if (typeof val === 'string' || typeof val === 'boolean') {
|
||
|
|
val = Number(val);
|
||
|
|
}
|
||
|
|
|
||
|
|
assert.ok(!isNaN(val));
|
||
|
|
if (val instanceof Number) {
|
||
|
|
return val.valueOf();
|
||
|
|
}
|
||
|
|
if (typeof val === 'number') {
|
||
|
|
return val;
|
||
|
|
}
|
||
|
|
if (!Array.isArray(val) && typeof val.valueOf === 'function') {
|
||
|
|
return Number(val.valueOf());
|
||
|
|
}
|
||
|
|
if (val.toString && !Array.isArray(val) && val.toString() == Number(val)) {
|
||
|
|
return Number(val);
|
||
|
|
}
|
||
|
|
|
||
|
|
assert.ok(false);
|
||
|
|
};
|