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number.js
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number.js
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const utils = require('./utils');
/**
* @exports number
*/
const helpers = module.exports;
/**
* Format a number to it's equivalent in bytes. If a string is passed,
* it's length will be formatted and returned.
*
* **Examples:**
*
* - `'foo' => 3 B`
* - `13661855 => 13.66 MB`
* - `825399 => 825.39 kB`
* - `1396 => 1.4 kB`
*
* @param {Number|String} `number`
* @return {String}
* @api public
*/
helpers.bytes = function(number, precision, options) {
if (number == null) return '0 B';
if (!utils.isNumber(number)) {
number = number.length;
if (!number) return '0 B';
}
if (!utils.isNumber(precision)) {
precision = 2;
}
const abbr = ['B', 'kB', 'MB', 'GB', 'TB', 'PB', 'EB', 'ZB', 'YB'];
precision = Math.pow(10, precision);
number = Number(number);
let len = abbr.length - 1;
while (len-- >= 0) {
const size = Math.pow(10, len * 3);
if (size <= (number + 1)) {
number = Math.round(number * precision / size) / precision;
number += ' ' + abbr[len];
break;
}
}
return number;
};
/**
* Helper `fileSize` is deprecated. Use `helper.bytes` instead.
*/
helpers.fileSize = helpers.bytes;
/**
* Add commas to numbers
*
* @param {Number} `num`
* @return {Number}
* @api public
*/
helpers.addCommas = function(num) {
return num.toString().replace(/(\d)(?=(\d\d\d)+(?!\d))/g, '$1,');
};
/**
* Convert a string or number to a formatted phone number.
*
* @param {Number|String} `num` The phone number to format, e.g. `8005551212`
* @return {Number} Formatted phone number: `(800) 555-1212`
* @source http://bit.ly/QlPmPr
* @api public
*/
helpers.phoneNumber = function(num) {
num = num.toString();
return '(' + num.substr(0, 3) + ') '
+ num.substr(3, 3) + '-'
+ num.substr(6, 4);
};
/**
* Abbreviate numbers to the given number of `precision`. This is for
* general numbers, not size in bytes.
*
* @param {Number} `number`
* @param {Number} `precision`
* @return {String}
* @api public
*/
helpers.toAbbr = function(number, precision) {
if (!utils.isNumber(number)) {
number = 0;
}
if (utils.isUndefined(precision)) {
precision = 2;
}
number = Number(number);
// 2 decimal places => 100, 3 => 1000, etc.
precision = Math.pow(10, precision);
const abbr = ['k', 'm', 'b', 't', 'q'];
let len = abbr.length - 1;
while (len >= 0) {
const size = Math.pow(10, (len + 1) * 3);
if (size <= (number + 1)) {
number = Math.round(number * precision / size) / precision;
number += abbr[len];
break;
}
len--;
}
return number;
};
/**
* Returns a string representing the given number in exponential notation.
*
* ```handlebars
* {{toExponential number digits}};
* ```
* @param {Number} `number`
* @param {Number} `fractionDigits` Optional. An integer specifying the number of digits to use after the decimal point. Defaults to as many digits as necessary to specify the number.
* @return {Number}
* @api public
*/
helpers.toExponential = function(number, digits) {
if (!utils.isNumber(number)) {
number = 0;
}
if (utils.isUndefined(digits)) {
digits = 0;
}
return Number(number).toExponential(digits);
};
/**
* Formats the given number using fixed-point notation.
*
* ```handlebars
* {{toFixed "1.1234" 2}}
* //=> '1.12'
* ```
* @param {Number} `number`
* @param {Number} `digits` (Optional) The number of digits to appear after the decimal point; this may be a value between 0 and 20. If this argument is omitted, it is treated as 0.
* @return {String} A string representing the given number using fixed-point notation.
* @api public
*/
helpers.toFixed = function(number, digits) {
if (!utils.isNumber(number)) {
number = 0;
}
if (!utils.isNumber(digits)) {
digits = 0;
}
return Number(number).toFixed(digits);
};
/**
* @param {Number} `number`
* @return {Number}
* @api public
*/
helpers.toFloat = function(number) {
return parseFloat(number);
};
/**
* @param {Number} `number`
* @return {Number}
* @api public
*/
helpers.toInt = function(number) {
return parseInt(number, 10);
};
/**
* Returns a string representing the `Number` object to the specified precision.
*
* ```handlebars
* {{toPrecision "1.1234" 2}}
* //=> '1.1'
* ```
* @param {Number} `number`
* @param {Number} `precision` (Optional) An integer specifying the number of significant digits. If precison is not between 1 and 100 (inclusive), it will be coerced to `0`.
* @return {String} A string representing a Number object in fixed-point or exponential notation rounded to precision significant digits.
* @api public
*/
helpers.toPrecision = function(number, precision) {
if (!utils.isNumber(number)) {
number = 0;
}
if (!utils.isNumber(precision)) {
precision = 1;
}
return Number(number).toPrecision(precision);
};