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'use strict'; var $ = require('../internals/export'); var requireObjectCoercible = require('../internals/require-object-coercible'); var toInteger = require('../internals/to-integer'); var toString = require('../internals/to-string'); var slice = ''.slice; var max = Math.max; var min = Math.min; // `String.prototype.substr` method // https://tc39.es/ecma262/#sec-string.prototype.substr $({ target: 'String', proto: true }, { substr: function substr(start, length) { var that = toString(requireObjectCoercible(this)); var size = that.length; var intStart = toInteger(start); var intLength, intEnd; if (intStart === Infinity) intStart = 0; if (intStart < 0) intStart = max(size + intStart, 0); intLength = length === undefined ? size : toInteger(length); if (intLength <= 0 || intLength === Infinity) return ''; intEnd = min(intStart + intLength, size); return intStart >= intEnd ? '' : slice.call(that, intStart, intEnd); } });