18 lines
596 B
JavaScript
18 lines
596 B
JavaScript
"use strict";
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var toInteger = require("../../../number/to-integer")
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, value = require("../../../object/valid-value")
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, isValue = require("../../../object/is-value")
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, min = Math.min
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, max = Math.max;
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module.exports = function (searchString /*, endPosition*/) {
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var self, start, endPos;
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self = String(value(this));
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searchString = String(searchString);
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endPos = arguments[1];
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start =
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(isValue(endPos) ? min(max(toInteger(endPos), 0), self.length) : self.length) -
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searchString.length;
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return start < 0 ? false : self.indexOf(searchString, start) === start;
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};
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