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Luis Fernando Molina committed 2020-11-20 14:05:59 +01:00
1 parent 8b3382289b
commit cfcada880d
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-13
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/**
* Returns a `Boolean` on whether or not the a `String` starts with '0x'
* @param {String} str the string input value
* @return {Boolean} a boolean if it is or is not hex prefixed
* @throws if the str input is not a string
*/
module.exports = function isHexPrefixed(str) {
if (typeof str !== 'string') {
throw new Error("[is-hex-prefixed] value must be type 'string', is currently type " + (typeof str) + ", while checking isHexPrefixed.");
}
return str.slice(0, 2) === '0x';
}
-66
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const isHexPrefixed = require('../index.js');
const assert = require('chai').assert;
describe("isHexPrefixed", () => {
describe("constructor", () => {
it("should have the method exported", () => {
assert.equal(typeof isHexPrefixed, 'function');
});
});
describe("should function normall", () => {
it('should isHexPrefixed check if hex is prefixed', () => {
assert.equal(isHexPrefixed('0xsdffsd'), true);
assert.equal(isHexPrefixed('0x'), true);
assert.equal(isHexPrefixed('0x3982349284'), true);
assert.equal(isHexPrefixed('0x824723894jshdksjdhks'), true);
});
it('should isHexPrefixed check if hex is prefixed not prefixed', () => {
assert.equal(isHexPrefixed('sdffsd'), false);
assert.equal(isHexPrefixed(''), false);
assert.equal(isHexPrefixed('3982349284'), false);
assert.equal(isHexPrefixed('824723894jshdksjdhks'), false);
});
it('should isHexPrefixed throw as expected string got buffer', () => {
try {
isHexPrefixed(new Buffer());
} catch (error) {
assert.equal(typeof error, 'object');
}
});
it('should isHexPrefixed throw as expected string got empty object', () => {
try {
isHexPrefixed({});
} catch (error) {
assert.equal(typeof error, 'object');
}
});
it('should isHexPrefixed throw as expected string got number', () => {
try {
isHexPrefixed(823947243994);
} catch (error) {
assert.equal(typeof error, 'object');
}
});
it('should isHexPrefixed throw as expected string got undefined', () => {
try {
isHexPrefixed(undefined);
} catch (error) {
assert.equal(typeof error, 'object');
}
});
it('should isHexPrefixed throw as expected string got null', () => {
try {
isHexPrefixed(null);
} catch (error) {
assert.equal(typeof error, 'object');
}
});
});
});