flow like the river

VISUALIZACION/node_modules/es-abstract/2017/SplitMatch.js

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+'use strict';
+
+var GetIntrinsic = require('get-intrinsic');
+var callBound = require('call-bind/callBound');
+
+var $TypeError = GetIntrinsic('%TypeError%');
+
+var Type = require('./Type');
+
+var isInteger = require('../helpers/isInteger');
+
+var $charAt = callBound('String.prototype.charAt');
+
+// https://262.ecma-international.org/6.0/#sec-splitmatch
+
+module.exports = function SplitMatch(S, q, R) {
+	if (Type(S) !== 'String') {
+		throw new $TypeError('Assertion failed: `S` must be a String');
+	}
+	if (!isInteger(q)) {
+		throw new $TypeError('Assertion failed: `q` must be an integer');
+	}
+	if (Type(R) !== 'String') {
+		throw new $TypeError('Assertion failed: `R` must be a String');
+	}
+	var r = R.length;
+	var s = S.length;
+	if (q + r > s) {
+		return false;
+	}
+
+	for (var i = 0; i < r; i += 1) {
+		if ($charAt(S, q + i) !== $charAt(R, i)) {
+			return false;
+		}
+	}
+
+	return q + r;
+};