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RN: Polyfill `String#padEnd` and `String#padStart` 

Summary: Adds polyfills for `String.prototype.padEnd` and `String.prototype.padStart`.

Reviewed By: mjesun

Differential Revision: D9233437

fbshipit-source-id: 3430450f28b4cec8f1c74af5f169e9bdef044ae8
This commit is contained in:
Tim Yung 2018-08-13 11:47:23 -07:00 committed by Facebook Github Bot
parent 66089bf150
commit c1ecd8aefc
1 changed files with 34 additions and 0 deletions
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34
Libraries/polyfills/String.prototype.es6.js
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@ -124,3 +124,37 @@ if (!String.prototype.codePointAt) {
return first;
};
}
// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/padEnd
if (!String.prototype.padEnd) {
String.prototype.padEnd = function padEnd(targetLength, padString) {
targetLength = targetLength >> 0; //floor if number or convert non-number to 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); //append to original to ensure we are longer than needed
}
return String(this) + padString.slice(0, targetLength);
}
};
}
// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/padStart
if (!String.prototype.padStart) {
String.prototype.padStart = function padStart(targetLength, padString) {
targetLength = targetLength >> 0; //truncate if number or convert non-number to 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); //append to original to ensure we are longer than needed
}
return padString.slice(0, targetLength) + String(this);
}
};
}