85 lines
1.9 KiB
JavaScript
85 lines
1.9 KiB
JavaScript
'use strict';
|
|
|
|
var _ = require('lodash');
|
|
|
|
/**
|
|
* Determines whether a string contains only hexadecimal values
|
|
*
|
|
* @name JSUtil.isHexa
|
|
* @param {string} value
|
|
* @return {boolean} true if the string is the hexa representation of a number
|
|
*/
|
|
var isHexa = function isHexa(value) {
|
|
if (!_.isString(value)) {
|
|
return false;
|
|
}
|
|
return /^[0-9a-fA-F]+$/.test(value);
|
|
};
|
|
|
|
/**
|
|
* @namespace JSUtil
|
|
*/
|
|
module.exports = {
|
|
/**
|
|
* Test if an argument is a valid JSON object. If it is, returns a truthy
|
|
* value (the json object decoded), so no double JSON.parse call is necessary
|
|
*
|
|
* @param {string} arg
|
|
* @return {Object|boolean} false if the argument is not a JSON string.
|
|
*/
|
|
isValidJSON: function isValidJSON(arg) {
|
|
var parsed;
|
|
if (!_.isString(arg)) {
|
|
return false;
|
|
}
|
|
try {
|
|
parsed = JSON.parse(arg);
|
|
} catch (e) {
|
|
return false;
|
|
}
|
|
if (typeof(parsed) === 'object') {
|
|
return true;
|
|
}
|
|
return false;
|
|
},
|
|
isHexa: isHexa,
|
|
isHexaString: isHexa,
|
|
|
|
/**
|
|
* Clone an array
|
|
*/
|
|
cloneArray: function(array) {
|
|
return [].concat(array);
|
|
},
|
|
|
|
/**
|
|
* Define immutable properties on a target object
|
|
*
|
|
* @param {Object} target - An object to be extended
|
|
* @param {Object} values - An object of properties
|
|
* @return {Object} The target object
|
|
*/
|
|
defineImmutable: function defineImmutable(target, values) {
|
|
Object.keys(values).forEach(function(key){
|
|
Object.defineProperty(target, key, {
|
|
configurable: false,
|
|
enumerable: true,
|
|
value: values[key]
|
|
});
|
|
});
|
|
return target;
|
|
},
|
|
/**
|
|
* Checks that a value is a natural number, a positive integer or zero.
|
|
*
|
|
* @param {*} value
|
|
* @return {Boolean}
|
|
*/
|
|
isNaturalNumber: function isNaturalNumber(value) {
|
|
return typeof value === 'number' &&
|
|
isFinite(value) &&
|
|
Math.floor(value) === value &&
|
|
value >= 0;
|
|
}
|
|
};
|