count-helper
Version:
Time count helper with vanilla Javascript
68 lines (67 loc) • 3.17 kB
JavaScript
/***********************************************************************************************************************
* https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/repeat
* String.prototype.repeat
* Feature Chrome Firefox Internet Explorer Opera Safari Edge
* Basic support all all all all all all
* -------------------------------------------------------------------------------
*/
if (!String.prototype.repeat) {
String.prototype.repeat = function (count) {
'use strict';
if (this === null)
throw new TypeError('can\'t convert ' + this + ' to object');
var str = '' + this;
// To convert string to integer.
count = +count;
// Check NaN
if (count !== count)
count = 0;
if (count < 0)
throw new RangeError('repeat count must be non-negative');
if (count === Infinity)
throw new RangeError('repeat count must be less than infinity');
count = Math.floor(count);
if (str.length === 0 || count === 0)
return '';
// Ensuring count is a 31-bit integer allows us to heavily optimize the
// main part. But anyway, most current (August 2014) browsers can't handle
// strings 1 << 28 chars or longer, so:
if (str.length * count >= 1 << 28)
throw new RangeError('repeat count must not overflow maximum string size');
var maxCount = str.length * count;
count = Math.floor(Math.log(count) / Math.log(2));
while (count) {
str += str;
count--;
}
str += str.substring(0, maxCount - str.length);
return str;
};
}
/**********************************************************************************************************************/
/***********************************************************************************************************************
* https://github.com/uxitten/polyfill/blob/master/string.polyfill.js
* String.prototype.padStart
* version 1.0.1
* Feature Chrome Firefox Internet Explorer Opera Safari Edge
* Basic support 57 51 (No) 44 10 15
* With polyfill all all all all all all
* -------------------------------------------------------------------------------
*/
if (!String.prototype.padStart) {
String.prototype.padStart = function padStart(targetLength, padString) {
targetLength = targetLength >> 0;
padString = String(typeof padString !== 'undefined' ? padString : ' ');
if (this.length > targetLength) {
return String(this);
}
else {
targetLength = targetLength - this.length;
if (targetLength > padString.length) {
padString += padString.repeat(targetLength / padString.length);
}
return padString.slice(0, targetLength) + String(this);
}
};
}
/**********************************************************************************************************************/