Commit

1 files changed, 47 insertions, 0 deletions

diff --git a/src/node_modules/es-abstract/2018/IsStringPrefix.js b/src/node_modules/es-abstract/2018/IsStringPrefix.js
new file mode 100644
index 0000000..f5e2996
--- /dev/null
+++ b/src/node_modules/es-abstract/2018/IsStringPrefix.js
@@ -0,0 +1,47 @@
+'use strict';
+
+var GetIntrinsic = require('../GetIntrinsic');
+
+var $TypeError = GetIntrinsic('%TypeError%');
+
+var isPrefixOf = require('../helpers/isPrefixOf');
+
+// var callBound = require('../helpers/callBound');
+
+// var $charAt = callBound('String.prototype.charAt');
+
+var Type = require('./Type');
+
+// https://www.ecma-international.org/ecma-262/9.0/#sec-isstringprefix
+
+module.exports = function IsStringPrefix(p, q) {
+	if (Type(p) !== 'String') {
+		throw new $TypeError('Assertion failed: "p" must be a String');
+	}
+
+	if (Type(q) !== 'String') {
+		throw new $TypeError('Assertion failed: "q" must be a String');
+	}
+
+	return isPrefixOf(p, q);
+	/*
+	if (p === q || p === '') {
+		return true;
+	}
+
+	var pLength = p.length;
+	var qLength = q.length;
+	if (pLength >= qLength) {
+		return false;
+	}
+
+	// assert: pLength < qLength
+
+	for (var i = 0; i < pLength; i += 1) {
+		if ($charAt(p, i) !== $charAt(q, i)) {
+			return false;
+		}
+	}
+	return true;
+	*/
+};