How to use the head function from lodash
Find comprehensive JavaScript lodash.head code examples handpicked from public code repositorys.
lodash.head is a function that returns the first element of an array or array-like object.
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const to = _.uniq(users.map((user) => user.email)); // <https://stackoverflow.com/a/49731453> const locales = users.map((user) => user[config.lastLocaleField]); const locale = _.head(_(locales).countBy().entries().maxBy(_.last)); return { to, locale }; }
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module.exports.gte = _.gte; module.exports.gteContrib = _.gteContrib; module.exports.has = _.has; module.exports.hasIn = _.hasIn; module.exports.hasPath = _.hasPath; module.exports.head = _.head; module.exports.humanize = _.humanize; module.exports.identity = _.identity; module.exports.implode = _.implode; module.exports.inRange = _.inRange;
+ 92 other calls in file
How does lodash.head work?
lodash.head is a function from the popular utility library lodash that returns the first element of an array. It can also be used to return the first n elements of an array. If the input array is empty, the function returns undefined.
GitHub: mrijk/speculaas
![mrijk profile picture](/mrijk.png?size=40)
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if (_.isEmpty(specs)) { return _.isEmpty(values) ? {} : invalidString; } for (let [head, rest] of generate(values)) { const [key, predicate] = _.head(specs); const conformHead = conform(predicate, head, true); if (conformHead !== invalidString) { const conformRest = _conform(_.tail(specs), rest);
GitHub: mdmarufsarker/lodash
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console.log(flattenDepth); // => [1, 2, 3, [4], 5] const fromPairs = _.fromPairs([['a', 1], ['b', 2]]); console.log(fromPairs); // => { 'a': 1, 'b': 2 } const head = _.head([1, 2, 3]); console.log(head); // => 1 const indexOf = _.indexOf([1, 2, 1, 2], 2); console.log(indexOf); // => 1
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Ai Example
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const numbers = [1, 2, 3, 4, 5]; const firstNumber = _.head(numbers); console.log(firstNumber); // 1
In this example, _.head is used to retrieve the first element of the numbers array and assign it to the firstNumber variable. The function returns the value 1, which is logged to the console.
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// const debugPrint = (...args) => internal.print('> '.repeat(stack.length + 1), ...args); // debugPrint(`checkResIsValidDfsOf(${JSON.stringify({paths, tree: tree.toObj(), stack})})`); assertTrue(!_.isEmpty(paths)); const vertex = tree.vertex; const curPath = _.head(paths); let remainingPaths = _.tail(paths); // push without modifying `stack` const curStack = stack.concat([vertex]);
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return { [tagKey]: tagValue } }), ) const nonCompliantTags = _.filter(requiredTags, (tagObj) => { const [tagName, tagValue] = _.head(Object.entries(tagObj)) validTagValues = (Array.isArray(tagValue) ? tagValue : [tagValue]).map( (x) => (typeof x === 'string' ? x.toLocaleLowerCase() : x), )
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GitHub: Qwiery/qwiery
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return _.find(this.#edges, (e) => e.sourceId === sourceId && e.targetId === targetId && _.includes(e.labels, label)) || null; } /** @inheritdoc */ async getEdgeBetween(sourceId, targetId) { return _.head(await this.getEdgesBetween(sourceId, targetId, 1)) || null; } /** @inheritdoc */ async getEdgesWithLabel(label, amount = 1000) {
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_.each(stepPartition, (stepNodes) => { const nodeOffset = (node) => { return node.relativePosition()[stepDim]; }; const name = _.head(stepNodes).data('parent'); const slope = (nodeOffset(_.last(stepNodes)) - nodeOffset(_.head(stepNodes))) / stepNodes.length;
+ 3 other calls in file
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if ((_.isUndefined(result) || _.isUndefined(result.txs)) || _.isEmpty(result.txs)) { throw new Error("This card was not validated. You must send 0.001 SMART in order to validate it"); } else if (result.txs.length == 1) { first = result.txs[0]; } else { first = _.head(_.sortBy(txs, ['time'])); } return first; } catch (err) { throw err;
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if(maxTuple === undefined){ return undefined } return { author: _.head(maxTuple), blogs: _.last(maxTuple) } }
GitHub: Hupeng7/es6demo
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//_.head(array) let head1 = _.head([1, 2, 3]); console.log('head1--->', head1); //head1---> 1 let head2 = _.head([]); console.log('head2--->', head2); //head2---> undefined //_.indexOf(array,value,[fromIndex=0])
lodash.get is the most popular function in lodash (7670 examples)